Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (Unaudited)

Quarterly Financial Data (Unaudited)

The following tabulation shows certain quarterly financial data for 2017 and 2016 (in thousands, except per share amounts):

	Quarter
2017	1		2		3		4
Net service revenues	$	1,287,370	$	1,308,428	$	1,324,709	$	1,346,282
Gross margin	$	525,828	$	538,438	$	546,400	$	553,146
Income before income taxes	$	125,501	$	130,707	$	132,270	$	129,038
Net income	$	78,521	$	80,316	$	84,700	$	47,047
Basic net income per share	$	.63	$	.64	$	.69	$	.38
Diluted net income per share	$	.62	$	.64	$	.68	$	.38

	Quarter
2016	1		2		3		4
Net service revenues	$	1,302,625	$	1,344,160	$	1,338,541	$	1,265,073
Gross margin	$	531,972	$	556,993	$	552,509	$	519,202
Income before income taxes	$	133,791	$	149,414	$	146,324	$	124,581
Net income	$	83,416	$	91,616	$	90,569	$	77,788
Basic net income per share	$	.65	$	.71	$	.71	$	.61
Diluted net income per share	$	.64	$	.71	$	.71	$	.61