Thanks, Kate. Good morning, everyone and thank you for joining us today to discuss our fourth quarter full year results and our future outlook. Primoris continues outstanding performance during the fourth quarter and has laid the groundwork for future growth, evolution and expansion of the company. Our customer confidence and request for our services continues at a high demand and we are well positioned to generate long-term value for our shareholders. Our most recent report from our contact management system shows our addressable opportunities continuing to grow quarter-over-quarter. We are pleased to finish the year with solid results across our operating segments. We achieved our goal of nearly $3 billion in revenue by 2019 with contributions from both our legacy business units and our acquired companies. Of particular note is the 70% growth in our MSA revenue and MSA backlog of $1.3 billion, or nearly half of our total backlog. This is a result of a clear goal we set for ourselves back in 2017, as we believe a strong MSA backlog provides a solid counter balance to the sometimes cyclical nature of the E&C business. Primoris ended the year with a strong balance sheet, having already paid down nearly a-quarter of the debt associated with the Willbros acquisition. I'm also pleased to report, we are well along our path as a successional integration of that acquisition and it is within the guidelines we set for ourselves and reported to our shareholders when we made the acquisition. We were also notified this week that Primoris has been named as one of the finalists by D CEO's 2019 Mergers & Acquisition Awards as recognition for acquisition excellence. Our outstanding fourth quarter cash balance allowed us to end the year with a strong cash balance and a reduction in our debt-to-equity ratio and we're gratified by our success in continuing to reduce our overall overhead expense in 2018. We achieved all of this, while maintaining a safety TRIR record of 0.51, below our internal goal and well below the construction industry average. Our employees are dedicated to building the best company in the services industry and are committed to delivering safe, quality, reliable and industry best-in-class performance. This dedication helps us deliver profitable, predictable and financial performance. Driving down to our operating segments. I'll start with our Power, Industrial & Engineering segment, where we now have over 2,000 employees working hard every day. During the fourth quarter, Tim Healy's ARB Industrial team wrapped up the successful Carlsbad power project. The plant was fully commissioned and achieved power to the grid flawlessly. Our client recognized the ARB team and later awarded them the 2018 safety award for the year for that company. We also saw increased revenue with a large refining customer in California, as California's SB 54 is driving this work toward the union contractors. Refining work, power jobs like the recently announced power plant with a battery storage component and our oilfield maintenance MSAs will help our team stay busy in 2019, while we continue to pursue the larger projects where timing is more uncertain. Our ARB Industrial Group's project opportunities continue to grow as we're bidding on work for long-term maintenance agreements, power projects, both renewable and carbon-based and compressor and terminal operations. Our Primoris Renewable Energy team achieved substantial completion of the largest solar installation to date in Texas. Although, that project will not hold that title for pretty long, as we have just recently announced the new Texas solar project that is more than double in size. It's a great win for Primoris Renewable Energy and a reflection of the quality performance they deliver on 2018's solar project. Our two engineering groups have been staying busy also. Randy Kessler and the OnQuest team are working on the modularization of the PDH heaters in Canada, while also completing the engineering design of our most recent 260,000 gallon per day peak shaving LNG facility in the New England area. Their prospects look ever promising in the peak shaver LNG market, as we're seeing more demand for these size units, a market where we have an extensive resume. The LNG cycle, both for these size units and the larger facilities, is definitely here and continuing to be released. Kevin Maloney and the Primoris Design & Construction team have been actively teaming up with other Primoris business units to develop work, such as the $20 million refining award for our I&M group we announced in this quarter. Our PDC team is actively working on FEED development and design projects for green diesel projects, isomerization units, alkylation units and refining upgrades to process the lighter crude slates. The refining and petrochem markets we serve through this group are definitely continuing to emerge and through this business unit, we not only get the engineering design, but also the ability to supply the fabrication and construction through Primoris' other business units. Primoris Canada had a big win, with the award of the engineering, procurement and construction of three new storage tanks in the Canadian oil sands. While under previous management, this business unit had struggled to achieve consistent performance. We commend Jeremy Kinch after joining Primoris' via the acquisition, for taking steps to cut overhead and right-size the business. While their normal prospect list of the MSA maintenance work in the oil sands facility continues, we are seeing other opportunities for their services as noted by this recently announced win. Primoris industrial contractors is also actively partnering with sister companies to pursue new work such as the award to our renewables teams for the new solar project and our PD&C group for the refining sector. Recent announcements by customers to move forward with major petrochemical, LNG expansions and Greenfield projects have set the stage for Kevin Smith's team to have a strong year, though timing of the new awards for them will likely mean their year will be back-end loaded. Moving on to our Civil segment. Those new projects should also lead to increased work for Jonas Beatty and that Primoris I&M team. Right now they are staying busy with MSA work for major chemical customers and cross selling their abilities with business units in the Power Industrial & Engineering segment. As customers have made steps to proceed with the new projects they've announced valued at billions of dollars, the first step for those facilities will be site, prep and earth work which is where Primoris' I&M team shines. We are seeing demand for their services in LNG projects, some recently sanctioned refining projects, PBC and MDI plants. Our Primoris Heavy Civil team had a steady fourth quarter and Mark Buchanan's team did a great job of navigating an exceptionally wet October. We continue to have a controlled attitude toward growth for this business units as we wrap up the legacy Belton area jobs this year. TxDOT has multiple $100 million plus projects out for bid this year and we are taking a disciplined approach to the growing market. With the funding now being released in Louisiana, we have redirected some of the efforts to our design build projects for Louisiana Department of Transportation and expect to be making some favorable project award announcements, an area where we have extensive experience and very favorable past financial performance. Our Transmission and Distribution segment led by Jeff Prim now employs over 2,300 workers. We have opened training centers in North Carolina and Texas and we are working along alongside our clients in their local community college and training facilities to help provide the qualified alignment needed to grow this business. As we approach its one year anniversary in this second quarter, this acquisition is on track to deliver the results we expected, a growth in MSA revenue, geographic expansion across the Southwest and East Coast and relationships with new utility customers. Our plan for 2019 is to continue expanding our training facilities, continue our move toward more owned rather than leased equipment and negotiate favorable renewables as legacy MSA agreements renew. The MSA business, our backlog for this segment was a large contributor to our record yearend MSA backlog. As we have previously announced some awards more are under way as we continue to see great growth opportunities in this market and the demand for our services. The client base has been and continues to be very supportive of our entry into this market. The largest component of our MSA backlog comes from our Utilities & Distribution segment. Starting this year we will move the results of Willbros' gas distribution unit out of the T&D segment and into the U&D segment where it more properly belongs. Mike Christy oversees this segment's 3,000-plus employees with work for Utility customers ranging from the East Coast to the West Coast and everywhere in between. In California, Scott Summers and the ARB Underground team responded to disaster areas caused by wildfires with teams working around the clock in challenging [Technical Difficulty] as we stated in our press release earlier this quarter, we stand behind our customers as they go through their bankruptcy process. This is a process we've lived through before with them so we know what we're doing. We have already began receiving payments from them for post petition work and all of our pre-petition work has had the proper protections placed and falls within two of the three critical categories authorized for payment by the proceedings. We feel confident we will receive all of our payments and we will be patient with our clients as they work through their issues. While the wildfires have been devastating for the residents of California, they are providing opportunities for us to help utilities with fire hardening programs and we expect this to drive demand over the next several years. Doug Reeves led Q3C to another successful quarter, but the Arctic freeze throughout the Northwest -- in the Midwest, pardon me, last month is sure to intensify the usual seasonal first quarter slowdown as we start off in 2019. After they thaw out we expect Q3C to have another profitable and record year. Our open shop utility unit, Primoris Distribution Services continues to perform well and combined with the Willbros Gas Distribution unit, we are expanding our ability to serve customers across the Southwest and up to East Coast. Our strategic plan calls for this unit to not only grow through the Southeast, but also the Midwest and Southwest and Jason Osborn will be working alongside Mike Christy to make that a reality. Our final operating segment is the Pipeline & Underground segment. I'll start by discussing the Atlantic Coast pipeline project as that project has dominated much of the headlines over the last past several months. On February the 1, our client announced that they were halting construction on the project until the fall of 2019. At the same time they also increased the total cost of the project by another $500 million. So it now stands at an estimated $7 billion to $7.5 billion. This pushes out revenue on this project to the fourth quarter of this year and into 2020 and beyond, but our client was resolute in their commitment to the project and we still believe the pipeline will be completed, albeit not on its original time line. There is not much more I can add other than what has been released by our client in their own press releases. Our guidance for the year has a limited contribution from ACP. While the time line has been frustrating, Josh Ramsey now has clarity regarding Rockford's crews and availability and he is actively pursuing and securing new work for 2019. There are several projects we believe will help bridge the gap until the remobilization of ACP. We are very close to making a new project enhancement that will keep Josh's team working and will barn revenue quickly albeit not at the same level as the ACP project. Our open shop pipeline group, Primoris pipeline made significant progress on their two spreads of 24-inch natural gas liquids pipeline in the West Texas Permian Basin despite the project being under heavy rains for much of October. Patrick McRae's team should wrap up this project in the second quarter and the bid list of work for the remainder of 2019 for him looks as strong as it's been years. While both Rockford and Primoris pipeline had a strong funnel of opportunity, it's safe to assume that 2019 results will be weighted toward the second half of the year for both of them. Jeff Bridges and the Primoris Field Services group continue their strong execution on the 30-inch and 36 import and export gas pipelines projects. And while 2018 was a very back-end loaded year for them, we expect 2019 to be spread more evenly throughout the year. And at the corporate level, we expect to continue our path of driving down overhead costs reducing corporate debt and being diligent on our receivables and cash collections. We believe our conservative approach to growth offers our shareholders the best opportunity for a meaningful long-term appreciation as we look to our MSA backlog to provide a stable, recurring revenue base while opportunities in the petrochemical, renewable and refining markets provide potential upside. We are still looking at numerous acquisition targets and as always we keep our eye open for a good fit at the good price which adds value for our shareholders. I'll now turn it over to Ken for his comments about our numbers.