Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Quarterly information

The following tables present selected quarterly information (in thousands, except per share data):

	2016
	Quarters Ended
	March 31			June 30			September 30			December 31
Revenues	$	844,156		$	900,510		$	924,676		$	942,647
Gross profit	416,476			443,543			454,374			476,726
Net income (loss)	(31,111		)	44,711			51,450			61,750
Comprehensive income (loss)	61,394			(182,521		)	(18,533		)	(173,623		)
EPS
Basic EPS	(0.46		)	0.64			0.73			0.86
Diluted EPS	(0.46		)	0.64			0.72			0.86

	2015
	Quarters Ended
	March 31			June 30		September 30			December 31
Revenues	$	643,174		$	665,582	$	686,649		$	730,462
Gross profit	344,861			349,825		361,181			378,494
Net income	76,452			59,459		41,132			10,731
Comprehensive income (loss)	(59,141		)	104,323		(23,707		)	(10,317		)
EPS
Basic EPS	1.35			1.04		0.72			0.18
Diluted EPS	1.34			1.03		0.71			0.18