Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue	$ 463,657	$ 422,164
Cost of services	350,113	317,230
Gross profit	113,544	104,934
Selling, general and administrative expenses	50,212	46,146
Amortization of intangible assets	8,048	7,384
Income from operations	55,284	51,404
Interest expense—net	(11,503)	(10,774)
Income before income tax	43,781	40,630
Income tax (expense) benefit	(6,483)	744
Net income	$ 37,298	$ 41,374
Earnings per common share:
Common stock-basic (usd per share)	$ 0.64	$ 0.69
Common stock-diluted (usd per share)	$ 0.62	$ 0.68
Weighted average number of common shares outstanding:
Common stock-diluted (shares)	59,448,031	60,903,277