Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of Selected Quarterly Financial Data

The following table sets forth the selected quarterly financial data for each of the quarters in 2017 (in thousands, except per share amounts):

	Quarter Ended
	March 31,		June 30,		September 30,		December 31,
	2017		2017		2017		2017
Year Ended December 31, 2017:
Revenue	$	893,448	$	924,513	$	1,054,360	$	1,162,576
Gross margin		101,585		101,317		116,524		138,091
Operating income		17,177		16,578		21,669		41,127
Net income		10,334		9,542		15,334		99,943
Basic earnings per share	$	0.31	$	0.29	$	0.46	$	3.01
Diluted earnings per share	$	0.31	$	0.29	$	0.46	$	2.99

The following table sets forth the selected quarterly financial data for each of the quarters in 2016 (in thousands, except per share amounts):

	Quarter Ended
	March 31,		June 30,		September 30,		December 31,
	2016		2016		2016		2016
Year Ended December 31, 2016:
Revenue	$	805,859	$	855,557	$	932,814	$	978,560
Gross margin		108,387		114,490		111,454		120,454
Operating income		28,843		34,297		29,855		30,839
Net income		17,965		20,671		17,924		18,244
Basic earnings per share	$	0.51	$	0.61	$	0.54	$	0.55
Diluted earnings per share	$	0.51	$	0.61	$	0.54	$	0.55