Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Revenue	$ 602,461	$ 532,441
Cost of revenue	400,395	355,682
Gross profit	202,066	176,759
Operating expenses:
Selling, general and administrative	146,234	119,997
Depreciation and amortization	20,089	11,710
Total operating expenses	166,323	131,707
Income from operations	35,743	45,052
Interest expense, net, and other	11,054	5,673
Income before income taxes	24,689	39,379
Income tax expense	11,724	5,257
Net income	12,965	34,122
Other comprehensive loss:
Foreign currency translation and other	(47)	(101)
Other comprehensive loss	(47)	(101)
Comprehensive income	$ 12,918	$ 34,021
Net income per common share:
Basic (in dollars per share)	$ 0.27	$ 0.73
Diluted (in dollars per share)	$ 0.27	$ 0.71
Weighted average common shares outstanding:
Basic (shares)	47,359	46,784
Diluted (shares)	47,641	47,772