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Thomas L. Brown -- Senior Vice President and Chief Financial Officer

Thanks, Aaron, and good morning, everyone. As reported last evening, first quarter 2019 operating earnings were $0.71 per share. We continue to experience top-line growth, while recording a combined ratio of below 90, and generating nearly $2 of growth in book value per share, as solid operating earnings were bolstered by a very favorable investment market.

From an underwriting perspective, we posted a combined ratio of 89. This result improved nearly 2 points from first quarter prior year, as our loss ratio benefited from increased favorable reserve development. For the first quarter of 2019, we reported net favorable prior year's reserve development of $17 million, compared to $13 million, last year. I'll also add from a storm perspective, there was a minimum amount of loss in the quarter, about $1 million, and loss estimates for both 2017 and 2018 hurricanes remained unchanged.

We were pleased with each of our segments combined ratios; 96 in casualty, 79 in property, and a 70 in surety. Our casualty segment was favorably impacted by $11 million of net positive reserve development. Most casualty volumes developed favorably, including transportation, which posted a modest amount of favorable development for a second consecutive quarter. Our property segment posted favorable development of $2 million, exclusively from our marine line.

Finally, our surety segment had favorable development of $4 million. From a higher level, it is worth pointing out that our expense ratio is up about a point in the quarter, as our bonus and profit-sharing accruals correlate with the strong growth in earnings and book value. Overall, very solid underwriting results across our diverse product portfolio.

Turning to our top-line, gross written premiums advanced 6% in the quarter. Craig will provide more detailed discussion shortly, but growth was fairly broad-based and was achieved despite reductions from product exits in the prime quota share reduction that we announced during our fourth quarter call.

From a segment perspective, casualty grew top-line 8%. Growth was achieved in a number of established products as well as newer initiatives, including energy, casualty and general binding authority. We're pleased with this growth, but the segment is also the one most impacted by the recent product exits and the comparison to prior year may get more challenging as the year progresses.

Moving on to property, top-line grew by 7%. This growth was driven largely by marine, but also due to growth in our Hawaii homeowners group. Finally, surety posted a 2% decline in top-line as we remain disciplined in a very competitive environment. Complementing this underwriting performance, investment income continued to advance, up 16% compared to the first quarter of 2018. We have grown our invested asset base over the past year and continued to benefit from rotations in the portfolio and higher average yields. On a total return basis, our investment portfolio generated 4.5% return in the quarter. This return, coupled with solid operating performance, resulted in $95 million in comprehensive earnings for the quarter, driving book value up $1.95 per share after paying a $0.22 per share in ordinary dividend during the first quarter. Our overall business fundamentals, underwriting and investments results were very strong for the quarter, in conclusion, a very good start to the year.

And with that, I'll turn the call over to Craig.

Craig W. Kliethermes -- President and Chief Operating Officer

Thanks, Tom. Good morning, everyone. A very good start to the year with 6% top-line growth and an 89 combined ratio. Premium growth was a bit slower than previous quarters, but still a good result given the previously announced product exits. We've had some recent success focusing on growing our more established and most profitable products. We have nicknamed this initiative Grow What We Know, and this has helped us create more balance between newer products that take time to season, and those that deliver results today.

Overall, rates moderately improved from prior quarters. Larger increases are still compliant to spots where the pain is being felt most. Our discipline allows us to wait patiently for more widespread market opportunity. We are keeping an ear to the ground, alert for signs of disruption. It feels like the opportunity is not as distant as news of distress becomes more frequent. Let me provide a little more detail by segment.

In casualty, we grew 8%, while reporting a 96 combined ratio. Profitability was widespread, with six of our seven largest product lines reporting an underwriting profit for the quarter. Overall, we achieved a 3% rate increase across casualty. We continue to get a good blend of growth from newer and more established products. Recall, casualty is the segment most affected by some product exits in pruning announced last quarter. Underlying casualty growth, excluding this repositioning was 14%.

A couple of individual products in this segment are worth mentioning. The transportation business unit continues to focus on profitability improvement and opportunistic growth. Top-line was off 4% for the quarter, while achieving an overall 7% rate increase. We were able to recognize some favorable loss development and report an underwriting profit so far this year.

Our professional services group that focus on architects, engineers and miscellaneous professionals, also recorded a nice underwriting profit based on positive claim trends. A large portion of the growth in casualty was realized in our commercial and personal umbrella products, which grew over 15%. These are well established and historically profitable products for us. We also continue to see growth opportunities in our professional liability and commercial package businesses, as well as in our energy casualty and general binding authority businesses that were both started in 2016.

Our property segment grew 7%, and delivered a 79 combined ratio. All three major product groups achieved underwriting profitability. Rate in our property segment increased 6% for the quarter, largely driven by wind-exposed accounts and marine. Marine continues to grow at a double-digit rate, benefiting from the disruption in the market. This is creating an opportunity to build needed scale, while maintaining underwriting discipline, and a good loss ratio.

Our catastrophe business was down 5% on the top-line for the quarter, while rates were up about 5% for wind, and nearly flat for quake. As you are aware, there were several significant catastrophe events that occurred over the last two years, including hurricanes, earthquakes, floods, wildfires and even volcanic eruptions. Consistent with our track record, our original loss estimates continue to prove sufficient for these events.

Our Hawaii homeowners group grew 16% for the quarter. As we continue to invest in relationships and distribution, we have capitalized on very positive feedback from customers and producers on our timely claim handling of last year's lava related fire losses on the Big Island.

Sureties top-line was down 2%, but achieved an outstanding 70 combined ratio for the quarter. All four major product groups reported an underwriting profit.

Competition is quite challenging, particularly in the commercial and energy businesses, where underwriting appears to be undervalued by our competitors. Premiums are larger here, and a few bonds or accounts can swing the top-line. We continue to focus on widening our moat, investing in technology and the customer experience, supporting our contractors as they build their business, and better serving our producers by leveraging a broad set of surety offerings.

Overall, the ROI team delivered again this quarter with solid top-line growth and a sub-90 combined ratio. At RLI, we understand our recipe for success and how to tip the playing field to our advantage. We get great talent, immerse them in our disciplined ownership culture, and align them with compensation based on profitability over the long-term. We know what fits, what differentiates us, and understand the risk reward trade-offs. Our feedback loops are strong, and results are very visible. The team learns and adjust quickly, always keeping both ores in the water.

We know how to preserve and grow capital and focus resources on products where we can deliver differentiating service and exceptional financial results. At RLI, we will continue to be different because being different has proven to work. I want to thank all of our owner associates for the great start to 2019.

And I'll turn it back to Aaron to take questions.

Aaron H. Jacoby -- Vice President, Corporate Development

Great. Thanks, Craig. Operator, we can now open the call up for questions.

Questions and Answers:

Operator

Thank you, sir. The question-and-answer session will begin at this time. (Operator Instructions) Our first question comes from Matthew Carletti with JMP Securities.

Matthew Carletti -- JMP Securities -- Analyst

Hi. Thanks, good morning. Just Craig, maybe if I could go back to your casualty comments and just have you dig in a little deeper. I'm curious what you're seeing in the E&S environment for those lines, or in your E&S business, in particular, pricing, submission flow, standard line markets behavior. Are things starting to perk up there or is it largely unchanged?

Craig W. Kliethermes -- President and Chief Operating Officer

Well, I think that, if I go beyond just this quarter, I think, if you look over last year, I think, certainly submissions were up a little more. This quarter, I think, they were a little flatter, which is a little counter to probably what I have been reading, but for us at least submission -- submissions were relatively flat for the quarter.

Matthew Carletti -- JMP Securities -- Analyst

Okay, great. And then just a casualty kind of just broader, observing the accident year loss ratio, it was improved a little bit in Q1 versus a full-year, last year, it was at the lower end of, if I look back kind of a couple of years, kind of the lower end of the quarterly run rate. Is there anything particular going on there, or is it just varying mix by quarter or is it a view that you're getting pricing that's meeting or exceeding lost trend, is there anything to read into that or is it just more kind of how the cards fell?

Craig W. Kliethermes -- President and Chief Operating Officer

Matt, this is Craig, again. I would say it's pretty much mix related. And as you know, we've done a lot of repositioning, and particular in the casualty portfolio, so I probably couldn't isolate on one single thing.

Matthew Carletti -- JMP Securities -- Analyst

Okay, great. Thanks a lot and congrats on the quarter.

Craig W. Kliethermes -- President and Chief Operating Officer

Thanks.

Operator

We'll now take a question from Bijan Moazami from Compass Point Research.

Bijan Moazami -- Compass Point Research & Trading, LLC. -- Analyst

Good morning, everyone. From your commentary, it's very clear, you're getting rate increases across the board everywhere. And what's driving that rate increase across the industry? I guess, with the exception of commercial auto, it seems that a lot of the product lines doesn't appear to be showing adverse loss reserves in the industry, so just want to get a feeling of how sustainable those rate increases are? And then I have a follow-up question.

Craig W. Kliethermes -- President and Chief Operating Officer

Well, Bijan, this is Craig, again. I don't think I said it was across the portfolio, so just to clarify. But I mean, we have seen some selected spots continued in transportation, certainly, in the umbrella space, in certain geographies. In marine, we've seen more price than we've seen in the past. And the other places kind of have remained pretty stable as far as the increases. But those are relatively low single-digit rate increases that we're seeing, not -- nothing really out of the ordinary or anything out of what we've seen in the past.

Bijan Moazami -- Compass Point Research & Trading, LLC. -- Analyst

And the umbrella 15%, is that rate you mentioned, or is it premium volume growth, and if it's growing that fast, what's happening there?

Craig W. Kliethermes -- President and Chief Operating Officer

Well, I mean, we write both personal and commercial umbrella, so they're probably two different stories. Personal umbrella is more of an investment in technology, distribution, finding new partners. Commercial is -- I'll say, it's more geographic-focused. Certainly, there's some pain in certain areas that we are seeing increased submissions and increased opportunity, and some price but -- yes.

Bijan Moazami -- Compass Point Research & Trading, LLC. -- Analyst

And then finally, just you mentioned, binding authority business is growing for you guys, I just want to see what kind of business you're driving through MGAs.

Craig W. Kliethermes -- President and Chief Operating Officer

So the binding authority business, I mean, there will be some contractor, some rental dwelling exposures, some like plaza shopping centers, things like that, that will be the predominant classes of business that we view right now. These are smaller risks. These would not be -- obviously, that are not individually risk underwritten, so they're more in a box.

Bijan Moazami -- Compass Point Research & Trading, LLC. -- Analyst

Thank you.

Operator

We'll now take your question from Christopher Campbell with KBW.

Christopher Campbell -- KBW -- Analyst

Hi, good morning, gentlemen.

Jonathan E. Michael -- Chairman, President and Chief Executive Officer

Good morning.

Aaron H. Jacoby -- Vice President, Corporate Development

Hi. I guess, just following up on Matt's question on like the casualty core loss ratio, I guess, if you're growing umbrella as much as you are, should we expect to see that core loss ratio kind of decline over time?

Craig W. Kliethermes -- President and Chief Operating Officer

We have different loss ratios for different commercial umbrella products, so I wouldn't say that's necessarily true. Our casualty portfolio is made up of -- well, I said, seven major products, but within that, there's probably another dozen or so other smaller products, so it really depends on where you're -- where we're seeing the growth, and where we're shriking, obviously. And we exited some of those that had higher loss ratios anyway. So it's very difficult for me, at least on this call to pinpoint exactly what you're looking at, and -- OK.

Christopher Campbell -- KBW -- Analyst

Okay, got it. Yes. So I'm just thinking, if you're writing a lot more umbrella, that's probably a very low loss ratio business. And if that becomes a bigger mix at 15% growth over time, and if you're seeing that -- if you're seeing like technological opportunities in the personal side and then geographical on the commercial side, I would just expect that if I back out the reserve development from your stated loss ratio on casualty that, that number would go down over time, just as you grow umbrella? Is that a fair way to look at it, or is there a lot more (multiple speakers)

Craig W. Kliethermes -- President and Chief Operating Officer

Well, the one thing, Chris, I do want to clarify for you is we certainly would not be categorized as booking our commercial umbrella business to a low loss ratio, necessarily. I mean, that's not -- would not be standard practice for us. We would look at longer-term loss ratios in the pricing we're getting. And understand, that's a little bit more volatile business, so there's probably larger risk factors that are being considered when we decide what we're going to book that loss ratio to.

Christopher Campbell -- KBW -- Analyst

Okay, got it. So you have more like volatility built into that loss pick, like a fair way to think of it?

Jonathan E. Michael -- Chairman, President and Chief Executive Officer

Yes. We don't see the umbrella as a low loss ratio business at all (inaudible) different with that. Yes.

Christopher Campbell -- KBW -- Analyst

Okay, got it. And then you had mentioned -- I think, Craig mentioned in his speech, six out of the seven lines in casualty made an underwriting profit, so I'm just going to nitpick, like, which was the one that didn't?

Craig W. Kliethermes -- President and Chief Operating Officer

So that will be management -- our management liability group, which sells directors and officers coverages. It's a very volatile line of business with a little bit bigger limits. We do utilize reinsurance a little bit more there. So from quarter-to-quarter, you can have some volatile results. But it is one work we continue to watch closely.

Christopher Campbell -- KBW -- Analyst

Okay, got it. And there's nothing...

Craig W. Kliethermes -- President and Chief Operating Officer

And we are getting --

Christopher Campbell -- KBW -- Analyst

...like really concerning that you saw this quarter that was -- that would give you concern going forward?

Craig W. Kliethermes -- President and Chief Operating Officer

It's not a line that you're going to see a lot of necessarily trends, because it's not a frequency-driven line. It's a severity-driven line. So -- and it is one of those lines we are getting a substantial amount of rate this quarter as well, so we're watching it closely.

Christopher Campbell -- KBW -- Analyst

Okay, got you. And then you had mentioned a 3% rate increase in casualty, I guess, overall, what's like the all-in loss cost inflation? Like, how do you view that, what's like a longer-term average given like all the mix that you have in there to get an idea (multiple speakers)

Craig W. Kliethermes -- President and Chief Operating Officer

Sure. This is -- again, this is Craig. I mean, at least for our actuarial analysis, I believe we're using somewhere between 4% and 5% across our casualty portfolio, would be the average. I mean, there's going to be some that might be a little lower, some a little higher. So that's very much part of the explanation of why maybe our current accident year might be up a little bit in casualty as well because it's a math problem, right? If you're getting 3% rate and 4% trend -- 4% to 5% trend, that tells you your loss ratio should probably go up absent better underwriting.

Christopher Campbell -- KBW -- Analyst

Okay.

Craig W. Kliethermes -- President and Chief Operating Officer

Which is not (multiple speakers)

Christopher Campbell -- KBW -- Analyst

And then just one -- last one if I may. There is a new company who started trading recently, they does California earthquake. I know, that's your largest PML exposure. So I guess just what are your thoughts on the growth potential of that market? And then just in terms of reinsurance, I know, like there's been some talk about the Florida mid-year renewals increasing (inaudible) issues with California wildfire, could any of those higher reinsurance costs, are you guys expecting any of that to spill over into potentially -- into quake as well?

Craig W. Kliethermes -- President and Chief Operating Officer

Chris, I'll answer part of it. I think, Tom wants to answer part of it, too. Well, I guess, I'm hoping it spills over into the primary pricing, so that we -- it creates an opportunity for us. But our renewal is relatively flat at one-one. (ph) But obviously, if the cost of capital is higher for those guys to buy reinsurance, then hopefully, that will put some pressure on them to raise rates.

Thomas L. Brown -- Senior Vice President and Chief Financial Officer

This is Tom. Chris, I would just say to -- I think, we're speaking to the same company. It's a little heavier skew to personal lines, which we are not in the California quake area. And I think, you should probably all know the takeup rate on quake is relatively low, so maybe there's a plan there to see if perhaps a better uptake in that, I don't know.

Craig W. Kliethermes -- President and Chief Operating Officer

I would just add that I can tell you, our underwriters sort of report every quarter, there's a new market that's opened for quake in California. I don't know this particular one you're talking about here, but they would either tell you another MGA or another company has opened their doors in California quake market.

Christopher Campbell -- KBW -- Analyst

Okay, great. Well, thanks for all the colors. Best of luck all the rest of the year.

Craig W. Kliethermes -- President and Chief Operating Officer

Thanks.

Operator

Our next question will come from Jeff Schmitt with William Blair.

Jeff Schmitt -- William Blair -- Analyst

Hi. Good morning, everyone. Another question on the umbrella business. Just hearing in the market that large losses there are ticking up, particularly on the commercial side, just due to the tough legal environment, higher jury awards, high settlement amounts, is that what's causing sort of the dislocation there? I mean, it seems like you may have avoided that, but could be benefiting from a growth perspective?

Craig W. Kliethermes -- President and Chief Operating Officer

Jeff, this is Craig. I mean, I think, there obviously must be some pain in the marketplace from some of the other carriers. We obviously wouldn't be growing if we didn't think that we had the confidence that our results were good. It's the same team we've had in place for -- I don't know, over 20 years, writing in the same locations with the same policy forms, just higher rates than they have in the past. So I think, they have continued to see opportunity as people retrench.

Jeff Schmitt -- William Blair -- Analyst

Okay. And then the transportation book, what did you say top-line growth was there? I think, you had said there was 7% rate. I'm just curious where you're at in terms of the repair process or profitability? I mean, you've obviously been taking rate for some time now.

Craig W. Kliethermes -- President and Chief Operating Officer

Right. So I mean, obviously, we're going to continue to take rate if the opportunity permits because we want to get a fair rate and fair return. The top-line was down actually 4% for the quarter, and we had a 7% rate increase. So we're just a little more selective this quarter in certain spots and -- but we do think there's -- that is still a market in turmoil, transportation auto related exposures, in general, so we would expect that there's going to be -- the opportunity is going to persist for a while.

And as far as, I guess, you asked about -- you didn't say rehabilitating, but the relooking, reunderwriting, I mean, we've been through our reunderwriting process for, well, I don't know, we're like going on year three. So -- I mean, we've looked at all the accounts we have. We like the book of business that we currently have. Obviously, we like it better if we can get more rate even. But we're seeing a lot of new opportunities in that space from a lot of carriers that retrenched. And that is an area that I know a lot of people would like to see us right on -- through wholesale or E&S, which is a hotspot on E&S, and that's where a lot of those submissions are going, and I think, people are seeing as more flow in the E&S market for auto, that is not a market for us, necessarily. So we fill in specialty retailers for the most part in that.

Jeff Schmitt -- William Blair -- Analyst

Okay. And just on the E&S business, I guess, surprised to see submissions were -- I think, you said the flat. And just given some of the pullback by AIG, by Lloyds, are they just different parts of the market, I mean, or how is that impacting your E&S business?

Craig W. Kliethermes -- President and Chief Operating Officer

Again, this is Craig. I mean, our E&S business is, we're fairly narrow and deep in most of the places we play. So AIG was not a market that we necessarily went head-to-head with in very many places and London wasn't necessarily a place there that we would go head-to-head. But we do -- we ran into them occasionally, so certainly, it creates some opportunity. But I can't really tell you why necessarily our submission count was relatively flat for the quarter, but this quarter it was flat. We had seen an increase in submissions last year, and I don't have any reason to believe that -- this might not be an aberration.

Jeff Schmitt -- William Blair -- Analyst

Okay. Thank you.

Operator

We'll now take a question from Mark Dwelle with RBC.

Mark Dwelle -- RBC -- Analyst

Good morning. I guess, my first question is probably for Aaron, what do think the Mueller report is going to say about commercial auto pricing, and do you think the president will survive it?

Aaron H. Jacoby -- Vice President, Corporate Development

That's a good question, Mark, stay tuned for more.

Mark Dwelle -- RBC -- Analyst

Anyway. More specifically on commercial auto, you've obviously been getting rate there, but yet -- I mean, the premium growth is still negative. So I guess that tells me that there's still (inaudible) there's probably more business that you're net exiting than net winning in terms of the overall premium trend. We've been looking for rate in that sector for quite a while now. I mean, how much more rate do -- does -- would you say that the line generally needs before it would become what you'd call stable or maybe more attractive from a growth standpoint?

Craig W. Kliethermes -- President and Chief Operating Officer

Well, Mark, I mean, obviously, we'd like to grow if we find the accounts that meet our pricing criteria. So giving you an answer for the rate for the industry is kind of difficult. I mean, I also want to clarify, I believe we grew last year in transportation, so even though we might be off a little bit this quarter, it's not like we've been retrenching all last year. We actually saw a lot of opportunities last year to grow. And I don't -- I do anticipate we'll probably see more opportunities in the upcoming quarters. But we wouldn't be right if we don't think that the current business on our books is priced to underwriting profit. There's zero incentive to do otherwise here.

Mark Dwelle -- RBC -- Analyst

Okay. And then I guess, maybe to clarify better, then why -- what -- I mean, what were the drivers that resulted in the overall premium being lower despite a pretty hefty rate increase?

Thomas L. Brown -- Senior Vice President and Chief Financial Officer

Mark, it's Tom Brown. (inaudible) bit of context, we wrote just a little short of $18 million transportation in the quarter. So...

Mark Dwelle -- RBC -- Analyst

Okay.

Thomas L. Brown -- Senior Vice President and Chief Financial Officer

...what we're really speaking to, in terms of 4%, it's about $700,000, that could be influenced (inaudible)

Mark Dwelle -- RBC -- Analyst

Got it.

Thomas L. Brown -- Senior Vice President and Chief Financial Officer

...some of these accounts are fairly isignificant in terms of their own premium, so it could be influenced by one or two accounts as well.

Mark Dwelle -- RBC -- Analyst

Got it, that makes sense. And more broadly, in terms of the overall casualty business, the growth in the quarter was pretty good. The average rate increases were a piece of that, but there was, I guess, on balance, a lot of net new business allowing for both the ins and the outs. And I guess, again, kind of -- I'm sure it's different by line, but broadly, what do you see is creating the opportunity, is this just the economy's stronger, or the pricing is better, competitors are shying away? I guess -- where you guys have always been good at kind of filling in the gaps in the market, where -- are there -- is there any theme related to some of the gaps that you're finding opportunity in?

Craig W. Kliethermes -- President and Chief Operating Officer

Mark, this is Craig again. So I mean, the answer is different by different products. So obviously, we're seeing more shots on goal, in some places, submission increases in select spots, so we're getting more rate in certain spots. The economy is growing, exposures in certain areas on the casualty side. So it really depends, product-by-product, what's creating the opportunity.

The good thing is, we have a diversified enough portfolio that we're getting to see a lot of different things in a lot of different spaces. So we have our ear to the ground in a lot of different places, which helps us take advantage in the spots that -- where they avail themselves.

Mark Dwelle -- RBC -- Analyst

Okay.

Jonathan E. Michael -- Chairman, President and Chief Executive Officer

Also better marketing -- better marketing. We're doing a better job marketing some of our products. The customer experience is better, and I think, that has led to some of the growth that we're seeing in products like personal umbrella.

Mark Dwelle -- RBC -- Analyst

Okay. That makes sense, and it's consistent with the technology rollout that you mentioned there. I guess, just to finish on that -- that exact point, that personal umbrella, I know, that was an area where a couple of years ago, you had seen some adverse loss trend. I guess, I take it from your prior remarks that, that's not only died away, it's remaining at benign levels that you find it attractive to get growth there?

Craig W. Kliethermes -- President and Chief Operating Officer

So Mark, it happened to be the same quarter that we had some challenges in our transportation space. We had a hypothesis that, that might -- since they're both auto, personal umbrella is 80% auto-driven claims. We had a hypothesis that there might be an upcoming trend. It looks like that was an aberration based on that, because we haven't seen that kind of activity since. So never want to say never, but we haven't seen it other than that one quarter. But you have a good memory.

Mark Dwelle -- RBC -- Analyst

Somebody has to. You guys do too really, because you guys know where to go and where to leave, so that's good. I think, those are all my questions. Thanks for your help.

Craig W. Kliethermes -- President and Chief Operating Officer

Thanks, Mark.

Operator

(Operator Instructions) We'll go next to Randy Binner with B. Riley FBR.

Ryan Aceto -- B. Riley FBR -- Analyst

Good morning, everyone. This is actually Ryan Aceto on for Randy, this morning. I was hoping we could turn to the reserve development. I know, it's a little lumpy quarter-to-quarter, but could you give a little color on what accident years, or any line of business you're seeing that's coming through particularly favorable?

Thomas L. Brown -- Senior Vice President and Chief Financial Officer

Sure, Ryan. It's Tom Brown. So pretty much across the board in terms of the lines geo, and we mentioned transportation, my account was modestly favorable,with umbrella in our professional services group. And it's principally the more recent accident years, 2016 through '18, but the bulk, I would say, is in -- I'm talking casualty now, is between 2016 and '17 accident years. Property is primarily marine, and it's mostly in the more recent accident year 2018.

Ryan Aceto -- B. Riley FBR -- Analyst

Perfect, thank you. And I guess, turning to some of the newer lines you guys are getting into, more so energy and cyber, could you just give a little color on what you're seeing in the marketplace there? It seems like a lot more people are coming into the cyberspace, specifically.

Craig W. Kliethermes -- President and Chief Operating Officer

This is Craig, Ryan. I mean, we are continuing to see opportunities in cyber. I mean, people are building out their towers, so there's actually a need for capacity even though -- more people are buying, so it's creating more demand. But there are also -- obviously, there's a greater supply as well, but we're still seeing some opportunities. We write predominantly excess -- fairly high excess cyber. It's one we're growing very slowly and cautiously. But we do think it's actually diverse -- a good diversifying play for our management liability group, which has about seven or eight products. And I think, it's another product in their quiver for them to compete with. So it's -- I think, it's about -- last year, I think, we finished about $8 million worth of premium, so it's not huge for us.

Ryan Aceto -- B. Riley FBR -- Analyst

No, appreciate that. I'll leave it there.

Operator

If there are no further question, I will now turn the conference back to Mr. Jonathan Michael.

Jonathan E. Michael -- Chairman, President and Chief Executive Officer

Well, thank you, all. Nice quarter, a great start to the year, volume was up 6%, even with the product exits that we announced last quarter, the products that we're exiting, so we had little bit of headwind there. Combined ratio of 89, a great book value growth. I want to thank everyone for attending. Now, you may return to the Mueller report coverage.

Operator

Ladies and gentlemen, if you wish to access the replay for this call, you may do so by dialing 1-888-203-1112, with an ID number of 1822179. This concludes our conference for today. Thank you, all, for participating, and have a nice day. All parties may now disconnect.

Duration: 36 minutes

Call participants:

Aaron H. Jacoby -- Vice President, Corporate Development

Thomas L. Brown -- Senior Vice President and Chief Financial Officer

Craig W. Kliethermes -- President and Chief Operating Officer

Matthew Carletti -- JMP Securities -- Analyst

Bijan Moazami -- Compass Point Research & Trading, LLC. -- Analyst

Christopher Campbell -- KBW -- Analyst

Jonathan E. Michael -- Chairman, President and Chief Executive Officer

Jeff Schmitt -- William Blair -- Analyst

Mark Dwelle -- RBC -- Analyst

Ryan Aceto -- B. Riley FBR -- Analyst

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