Thank you, Erica and Alicia, and good morning, and welcome to Natural Gas Services Group's first quarter 2019 earnings review. This morning, we reported first quarter 2019 results and we are pleased with our operational performance. Our revenues grew 11% sequentially with all aspects of our business contributing to the increase. Compressor sales were very strong this quarter and our core rental revenues advanced 4%. EBITDA was $6.1 million this quarter, a 5% sequential and 7% year-over-year gain. We continue to construct and commission our large horsepower units, all of which are contracted, and both our medium and large horsepower units showed net gains in quarterly utilization. We entered the quarter with almost $40 million in cash with virtually no debt and remain positioned to further our growth this year. As we review of our financial results, I'll provide more detail on the operations. NGS reported total revenue of $18 million for the first quarter of 2019. As we look at total revenue, a 22% increase compared to same quarter of 2018. The increase is primarily driven by a 38% increase in sales and a 17% increase in rental revenues. Interestingly, our service and maintenance revenues almost doubled year-over-year. Although a smaller subset of our overall rentals, the associated gross margins in this segment run in the 70% range and we are receiving increased requests for third-party servicing of compressors and flares. Total revenue increased by 11% when compared to the fourth quarter of 2018, mainly due to the timing of sales revenue from compressor sales. Rental revenues increased 4% when compared to the fourth quarter 2018. Total adjusted gross margin for the three months ended March 31, 2019, increased to $8.3 million from $7.8 million for the same period ended March 31, 2018. Adjusted gross margin, which does not include depreciation, as a percentage of revenue for the three months ended March 31, 2019, was 46%, a decrease from 53% for the comparable period of 2018. Sequentially, adjusted gross margin increased from $8.2 million in the previous quarter of 2018. Adjusted gross margin, as a percentage of revenue, decreased to 46% for the three months ended March 31, 2019, compared to 51% in the prior quarter. The decrease in the adjusted gross margin, as a percent of revenue, can be attributed to shift in our revenue mix due to more sales in the first quarter 2019 which carried lower margins. Selling, general and administrative expenses of $2.5 million for the quarter increased when compared to $2 million in the first quarter of 2018. There are many components of overhead expenses that increased, among them being higher audit and health insurance expenses and non-cash items, such as stock expenses and noncontributory deferred comp. With that, however, SG&A as a percentage of revenue for the first quarter 2019 was 14%, which is the same percentage for the comparable period in 2018. Sequentially, SG&A as a percentage of revenue decreased from 15% in the fourth quarter 2018. Operating income was $209,000 in the first quarter 2019, which decreased from $350,000 in the year-over-year period, but increased from $106,000 in the fourth quarter of 2018. Operating income increased sequentially, but was impacted by lower rental margins due to a higher expenses related to overtime. Our overtime expenses are a direct reflection of the higher wage base in the Permian that most businesses operate in the oilfield have experienced over the last year. Additionally, the extra time spent to install and commission the larger horsepower compressor packages affected overtime paying this quarter. Higher SG&A expenses also contributed to lower year-over-year operating income. We reported net income for the three months ended March 31, 2019, of $357,000, up from $225,000 for the same period ended March 31, 2018. Sequentially, net income increased to a noncash adjustment for income tax expense related to executive comp, to which we've reported a net loss of $282,000 for the three months ended December 31, 2018. Excluding the tax adjustment expense, net income for the period was $351,000. Comparing sequentially with after-tax adjustment, our net income remained flat between the quarters. For the first quarter of 2019, the company posted earnings per diluted share of $0.03 compared to $0.02 in the first quarter 2018. Sequentially, diluted earnings per share increased $0.05. However, excluding the income tax adjustment expense, earnings per diluted share remained flat at $0.03. Earnings before interest, taxes, depreciation, amortization, or EBITDA, for the three months ended March 31, 2019, was $6.1 million, an increase from $5.7 million for the same period of 2018 and $5.8 million for the fourth quarter of 2018. EBITDA margins have roughly averaged about 36% of revenue in all comparative periods. Total sales revenues, which include compressors, flares and aftermarket activities, can be somewhat predictable and can cause considerable swings period to period. The uncertainty of the sales revenues can depend on the market and customer preference, which can vary period to period. On a year-over-year basis and sequentially, NGS sales revenue increased $1.1 million, primarily due to an increase in compressor sales. Compressor sales revenues of $2.7 million for the first quarter of 2019 increased year-over-year from $1.8 million. Sequentially, compressor sales increased from $1.5 million in the fourth quarter 2018 to $2.7 million this current quarter. If you recall last quarter, sales revenues came in a little light, but we caught up this quarter, again demonstrating the variability of this business line. First quarter 2019 total sales gross margin as a percentage of revenue was 10% compared to 20% in the fourth quarter of 2019 and 27% a year ago. Sales gross margins can fluctuate period-to-period due to scheduling and the timing of bidding. Additionally, we had a higher freight expense this quarter due to the income received from large horsepower equipment that impacted margins. Our sales backlog as of March 31, 2019, was approximately $11 million. This compares to the sales backlog of approximately $14 million in the fourth quarter 2018. We continue to be pleased with the results of our rental segment with rental revenue of $13.4 million for the first quarter 2019 and increasing sequentially and year-over-year. Additionally, rental revenue in the first quarter 2019 was the highest since the third quarter 2016. Comparing year-over-year 2019 to 2018 rental revenue, it increased 17% and sequentially increased 4%. As of March 31, 2019, 21% of our utilized horsepower is classified as large. This represents a significant shift in our fleet composition and demonstrates that the strategic direction we chose to pursue a couple of years ago was, in fact, the correct one. Compared to the fourth quarter 2018, our average rental rates on a per-unit basis increased 3% or essentially flat on an average per horsepower basis. Rental gross margins this quarter were 56%, a slight decrease from fourth quarter rental gross margin of 57% and last year's quarter of 59%. The slight margin impact is primarily attributable to higher labor and retirement expenses associated with installing and commissioning a large horsepower we had go out this quarter. Our fleet size at the end of December totaled 2,567 compressors, an addition of 8 units or almost 10,000-horsepower during the first quarter. Over the past 12 months, we have added 31 new fleet units that total 30,033-horsepower, almost entirely in our large category of horsepower. This represents an increase of 8% in total fleet horsepower while rented horsepower has increased 30%. Our utilization as measured by horsepower climbed from 58% last quarter to 59% this quarter, while unit base utilization remained constant at 53%. We saw an increase in rental units utilized at quarter end of 12% year-over-year and was flat sequentially, while our horsepower running in the field increased 30% year-over-year and 4% sequentially. We had 151 more rental units running in the first quarter 2019 than in the same period of 2018. As I noted in the last quarter's call, we anticipate our capital expense this year for rental fleet compression to be in the range of $37.5 million to $40 million, of which we spent $8.9 million this quarter. NGS is an enviable position in that 9% of that capital is already constructed at above market rates and long terms – or contracted, not constructed, something we are very excited about. Moving to the balance sheet. Our total bank debt continues at a little over $400,000 as of March 31, 2019, and our cash balance remains strong at $40 million. Cash flow from operating activities was negative $3.8 million for this quarter. This is mainly attributable to an increase in inventory for our large horsepower fabrication activities, which will naturally be bled down as these units are built and they add to the fleet. Receivables also increased due to a relatively large compressor sales order to a major customer had been billed but not paid by quarter end. We have, however, received the majority of that payment by the end of April. Payables were up due to a large payment for engines received in the fourth quarter of 2018. Essentially, most of the cash spent this year was for capital fleet additions and normal working capital variations. To summarize, we are pleased with the continued progress on our rental, sales and service and maintenance businesses and the associated revenues. Utilization continues to increase at a steady pace, along with pricing and we look forward to increased activity as we move through 2019 and the benefits of our focus on higher horsepower compression. As I conclude, I want to address what appears to be "a new movement focusing on positive earnings, positive returns and the need to live within free cash flow among oilfield service companies." Not only do we support this view, we have lived it for well over a decade as demonstrated through our financial results. That said, it is somewhat curious to me that this is a new great idea. It's always been a great idea. Just not an idea that many of our industry have practiced over time. In the past 15 years, NGS has never posted an annual GAAP EPS loss, which, we believe, is what has driven our consistent shareholder returns. In addition, over the past decade, we have carefully managed our balance sheet to operate with minimal leverage and focus on generating cash. That focus has served NGS well, allowing the company to invest in nearly $250 million of internally generated capital on advanced compression and new lines of business. Our model is to conserve cash as the cycle decelerates and opportunistically invest that cash as activity begins to improve to capture market share in existing markets and enter new strategic markets. That strategy allowed us to move into the gas lift compression market in the last downturn and has allowed us to make our current move into the high horsepower compression market as described over the past year. In short, our focus on full-cycle economics and our conservative approach to leverage has enabled NGS to protect our balance sheet, while consistently delivering positive earnings; not just EBITDA or adjusted EBITDA or further adjusted EBITDA, but real GAAP earnings. While we are not unique in our balance sheet management, we are proud to be one of only a few in our industry to meet these important benchmarks, which we believe have served our shareholders well. Erica, that's the end of my prepared remarks. So please open the phone lines for any questions.