Quarterly Financial Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Unaudited Quarterly Financial Results

(in thousands, except per share data)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Year ended December 31, 2016:
Revenue	$	567,725	$	572,135	$	584,065	$	616,124
Cost of revenue (exclusive of amortization of acquired intangible assets)	194,736		206,323		204,467		203,475
Net income	74,858		73,635		76,000		91,639
Basic net income per share	0.42		0.42		0.44		0.53
Diluted net income per share	0.42		0.42		0.43		0.52
Year ended December 31, 2015:
Revenue	$	526,536	$	540,723	$	551,030	$	579,159
Cost of revenue (exclusive of amortization of acquired intangible assets)	169,294		179,910		183,204		193,212
Net income	77,746		67,200		88,040		88,420
Basic net income per share	0.44		0.38		0.49		0.50
Diluted net income per share	0.43		0.37		0.49		0.49