Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Information

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

	2018
	Quarters Ended
	March 31		June 30		September 30		December 31
Revenues	$	1,215,877	$	1,261,943	$	1,283,751	$	1,310,083
Gross profit	593,447		610,142		623,442		639,148
Net income	62,894		67,618		124,825		110,022
Earnings per share:
Basic	0.79		0.85		1.56		1.37
Diluted	0.79		0.85		1.55		1.36

	2017
	Quarters Ended
	March 31		June 30		September 30		December 31
Revenues	$	949,525	$	1,066,421	$	1,152,261	$	1,200,221
Gross profit	480,564		544,218		569,901		580,596
Net income	42,062		45,805		79,900		65,215
Earnings per share:
Basic	0.58		0.59		1.02		0.83
Diluted	0.57		0.58		1.02		0.82