Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data

The following selected quarterly financial data for the year ended December 31, 2018 and 2017 as reclassified. Refer to Note 12 for additional information on the headcount reclassification.

	December 31		September 30		June 30		March 31
	(in thousands, except for per share data)
2018
Total revenues	$	4,186,841	$	3,999,374	$	3,907,270	$	3,700,856
Gross profit	1,453,441		1,468,246		1,504,839		1,400,277
Net income	133,934		402,835		384,349		290,124
Earnings per share:
Basic	$	0.31	$	0.92	$	0.88	$	0.67
Diluted	0.30		0.89		0.85		0.64
2017
Total revenues	$	3,285,755	$	2,984,859	$	2,785,464	$	2,636,635
Gross profit	1,071,421		898,620		793,768		895,904
Net income	185,517		129,590		65,600		178,222
Earnings per share:
Basic	$	0.43	$	0.30	$	0.15	$	0.41
Diluted	0.41		0.29		0.15		0.40