Anthony Guzzi
Analyst · FBR
Thanks, Mark, and we're on Page 9 and I'd pick up on his comments which is reflected our risk management as reflected on our balance sheet and how it has remained strong. I think it's reflected in our backlog also. And it shows that we've able to move between markets, invest in the right places and acquire in the right places to weather what has been a significant downturn in the current nonresidential markets especially in hospitality.
So let's talk about backlog. Backlog at the end of the quarter is about $3.4 billion, an increase of almost $100 million over the backlog at the end of March 2011 with in-period acquisitions accounting for all the increase. Organic backlog decreased $200 million year-over-year, but it improved sequentially from year end 2011. With our strong organic growth, we're pleased to see the growth in sequential backlog. We are seeing what we call growth straight through backlog in the sales over the last 3 quarters, as we've had strong organic growth in near flat backlog through that period.
That's typically a service dynamic. It's what we see in our service operations, but it's also occurring more our project work as we're getting more to the front end of the decision cycle especially in the industrial work and also happens when you are in the industrial work close to the owner and also happens early in a construction upcycle. Like we said, it's encouraging that the backlog is holding its own despite the strong organic growth over the last 3 quarters and 11% here in the quarter. Though impossible to measure, moderate temperature helped that organic growth and accelerated the revenues, but backlog again kept pace. Now we've spoken about EMCOR being a late cycle company in previous calls. And while it is still very early in any construction cycle to speak of seeing the revenue and backlog moving upward and revenue especially moving upward very strongly, it is a positive sign and must occur to eventually spark a strong recovery.
I like our position in this uneven economy and our backlog position dovetails with my earlier comments about our ability to utilize our diversity of service and construction offerings to respond to different market centers and to create stability and growth in a tough market and it's this diversity of demand that drives that.
So let's go look at – go through the bars that we always do here on this chart. A year ago March of 2011, commercial backlogs stood at $545 million or 17% of total backlog. At the end of first quarter 2012, commercial backlog is almost $1.1 billion and is 31% of total backlog. That's been doubled, but it's been aided by $260 million of USM, and USM has grown in backlog since we acquired it. But even without USM, commercial backlog has risen $250 million. And for clarification, some high-tech manufacturing work is also in our commercial backlog. It's always been there. And also some of the data center we worked on the private sector would be in our commercial backlog.
And you look at what's going on, it's not fully in backlog yet. It is important contract we won at both A&P and Ruby Tuesday's, and Ruby Tuesday, we'll be bringing on 742 sites. We're not there yet. We're going through the phase 1 of implementation but May, we move to phase 2. And it is a type of contact that prior to acquisition of USM, USM couldn't have done it. EMCOR couldn't have done it. And together we can do it. So we're starting to win business development it's revitalizing, and we're winning the right type of work for our backlogs. Industrial backlog remains flat although our revenues have benefited strongly for our industrial efforts. It's up 8% from March of 2011 despite strong activities from all EMCOR companies that perform that work.
In our refinery work in our shops where we bring the work into the shops to fix or fabricating some high end heat exchangers. That works up actually 45% as is March 2011 and March 2011 was up versus the trough. So we are seeing demand rebound in the refinery sector and the more seaway pipelines that get reversed and the Keystone pipeline get reversed, we're pretty bullish on the Gulf Coast. We have also had good performance on our California operations supporting the refineries out of Olmstead.
Health care is the light green segment. You've heard me talk about it. It's a little more episodic. It's a good long term market. We win our fair share of health care work. We won our fair health care share work and will always be a significant part of our backlog. It's a little bit down right now, but we really good at this work. And like industrial work, we get in at the front end and it takes a while to materialize. Institutional backlog is about 30% of our total backlog, about $1 billion. And it has been constant through '11 into '12. And our work is mainly federal, a little bit of state and local.
We're doing the lighting controls at that Saint Elizabeth campus. That's really the Homeland Security campus at the old Saint Elizabeth Hospital. And a lot of the work we do for the government, we do a lot of BRAC work and we do more in the future. We do work that makes government facilities more cost effective. We do work that allows them to consolidate, and we're still bullish that an outsourcing trend may emerge much like that happened prior to the current administration. It only makes too much sense economically. The final 2 sectors, transportation and water remain active and we have some nice large projects in there. Mark talked about one of them. You hit milestones in these projects, they tend to be either/or. Either you're going to make your payment or make your award or not. We do usually hit them. And we had some nice award from the City of Palm Beach to construct a new electrical generator plant, and we'll commence work on that over the next 6 months. [indiscernible] as Mark mentioned, revenue in the first quarter for domestic construction was $843 million. It was 22% above where it was. Despite that increase in revenue, you can see the strength of that operation. Our backlog is flat in U.S. construction. And that says we're in a fledgling recovery probably. I don't know if that's necessarily true. I know right now we are winning our share of good work and the capability our folks have built are really paying dividends for us in this tough market.
With that, let's move to Page 10. As we remove into remainder of '12, first, I would caution everybody. We are in the first quarter, which is usually our weakest quarter and we have a long way to go. But we're off to a good start. Revenue is stronger than expected. Operating margins are about where we expect them and we're not satisfied with these margins, but they reflect a couple of things. The start-up of new work and I went through all the dynamics of that, that also reflects the work we won in the recession and some would argue the recession is still going because trade unemployment is still in the high teens and low 20s. But with EMCOR's capabilities, there are a little different than what it's at and we've taken a long time to build those. Over the last 6 years to build the kind of capabilities that allow us to grow in a tough market.
Our conditions still remained uneven and it requires a steady handed discipline and our management team has that throughout our operations. So I'm going to go through now what we need to do to get to the top end of the guidance, things we can control to help get us there. But as you know, there's a whole bunch of things that are out of our control. What do we control? Discipline, and it's one of our hallmarks whether it'd be bidding execution or cost. Productivity, we like to think that a lot of people say you can't gain productivity in service and construction. We like to think that we can and we continually prove that we can.
We control cash deployment and Mark talked about, we made a little more activity on our buyback about 40% of our way through our initial authorization. We deployed some cash on the dividend over the last 3 quarters, and we deployed cash over the last 18 months rather aggressively reshaping our business, continuing to reshape our business to over $300 million. Areas that we don't control. Well, I know that better than ever good timing on buying a company that has excellence in snow management the way I call it. We don't control the weather. And hopefully, we'll have more normal weather patterns through the remainder of 2012.
I really didn't get excited about playing golf in January in Connecticut. I would rather have everybody be miserable with lots of snow especially in the Carolinas and Virginia, in those areas. We don't control customer spending on maintenance and capital. Our customers taught us through this recession that mandatory maintenance means discretionary and discretionary maintenance means sometimes when it breaks. We're seeing a little resumption of more normal maintenance spending, and we're seeing people pay for some of the shortsighted decisions they made in the recession, but it's nowhere near broad-based yet. And we're certainly don't control the general economy with Europe, and I still worry about $4 gasoline. I will always worry about $4 gasoline. It's not a good marker on the table for us. And we don't control those things.
However, based on our start, I think we have to raise revenue guidance because with 11% organic growth in the first quarter, our organic growth number didn't make sense where we had it for the rest of the year. And again I remember in February we told you there were 2 or 3 things that had to happen for us to start to get more confident on the air [ph] and most of them had happened in here in the first quarter that we needed to see happen to get to the revenue number that was better than what we initially said so. We see around $6.3 billion right now and consistent with our margin outlook that we had. We raised the bottom end of the range from $1.65 to $1.70. We're not trying to set a new trend here at EMCOR. It's just that our revenue were so much stronger here in the first quarter we felt compelled to do that and we don't see any outlook change in our margins today. Remember, we gave guidance when we had a pretty good view on the negative impact of the mild winter weather. And with that, I'll ask Laura to put you all in queue and we'll take your questions.