Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

The following tabulation shows certain quarterly financial data for 2015 and 2014 (in thousands, except per share amounts):

	Quarter
2015	1		2		3		4
Net service revenues	$	1,205,563	$	1,272,058	$	1,312,718	$	1,304,594
Gross margin	$	494,087	$	530,502	$	549,801	$	540,081
Income before income taxes	$	128,174	$	149,235	$	159,306	$	144,315
Net income	$	77,922	$	89,706	$	96,725	$	93,443
Basic net income per share	$	.59	$	.68	$	.74	$	.71
Diluted net income per share	$	.58	$	.67	$	.73	$	.71

	Quarter
2014	1		2		3		4
Net service revenues	$	1,084,342	$	1,164,914	$	1,224,308	$	1,221,450
Gross margin	$	438,495	$	478,444	$	505,220	$	500,757
Income before income taxes	$	102,014	$	123,653	$	138,361	$	133,321
Net income	$	61,551	$	75,140	$	85,184	$	84,053
Basic net income per share	$	.45	$	.56	$	.64	$	.63
Diluted net income per share	$	.45	$	.55	$	.63	$	.62