Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 501,758	$ 463,657
Cost of services	374,811	350,113
Gross profit	126,947	113,544
Selling, general and administrative expenses	55,875	50,212
Amortization of intangible assets	8,162	8,048
Income from operations	62,910	55,284
Interest expense — net	(11,948)	(11,503)
Income before income tax	50,962	43,781
Income tax expense	(8,920)	(6,483)
Net income	$ 42,042	$ 37,298
Earnings per common share:
Common stock-basic (usd per share)	$ 0.73	$ 0.64
Common stock-diluted (usd per share)	$ 0.71	$ 0.62
Weighted average number of common shares outstanding:
Common stock-diluted (shares)	58,752,384	59,448,031