Quarterly Financial Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018:
Revenue	$	668,724	$	662,759	$	669,628	$	713,363
Cost of revenue (exclusive of amortization of acquired intangible assets)	234,825		235,487		239,246		243,927
Net income	53,714		43,061		107,583		94,015
Basic net income per share	0.32		0.25		0.65		0.58
Diluted net income per share	0.31		0.25		0.64		0.57
Year ended December 31, 2017:
Revenue	$	600,293	$	605,832	$	624,440	$	658,470
Cost of revenue (exclusive of amortization of acquired intangible assets)	205,727		214,680		225,490		229,940
Net income	74,583		56,752		63,911		27,520
Basic net income per share	0.43		0.33		0.37		0.16
Diluted net income per share	0.43		0.33		0.37		0.16