Revenue Recognition - Statement of Operations Impact (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue
Revenue	$ 193,286	$ 232,221	$ 211,264	$ 169,567	$ 182,922	$ 266,042	$ 178,080	$ 139,039	$ 806,338	$ 766,083	$ 529,515
Cost of revenue									206,052	187,289	131,070
Gross margin	140,461	173,361	157,095	129,369	138,390	197,981	135,916	106,507	600,286	578,794	398,445
Operating income	45,247	77,844	63,455	34,596	50,775	110,849	60,021	37,216	221,142	258,861	154,066
Income before income tax expense									234,574	266,464	162,077
Income tax expense (benefit)									15,307	89,752	18,128
Net income	$ 45,418	$ 80,436	$ 56,196	$ 37,217	$ (27,747)	$ 102,493	$ 56,495	$ 45,471	$ 219,267	$ 176,712	$ 143,694
Net income per weighted-average common and common-equivalent share:
Net income (in dollars per share)	$ 0.26	$ 0.47	$ 0.33	$ 0.21	$ (0.16)	$ 0.59	$ 0.33	$ 0.26	$ 1.27	$ 1.02	$ 0.84
Net income (in dollars per share)	$ 0.26	$ 0.45	$ 0.32	$ 0.21	$ (0.16)	$ 0.57	$ 0.32	$ 0.25	$ 1.24	$ 0.98	$ 0.83
As previously reported
Revenue
Revenue										$ 747,950	$ 520,753
Cost of revenue										168,698	115,590
Gross margin										579,252	405,163
Operating income										259,319	160,784
Income before income tax expense										266,922	168,795
Income tax expense (benefit)										89,744	18,968
Net income										$ 177,178	$ 149,572
Net income per weighted-average common and common-equivalent share:
Net income (in dollars per share)										$ 1.02	$ 0.88
Net income (in dollars per share)										$ 0.99	$ 0.86
Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
Revenue
Revenue										$ 18,133	$ 8,762
Cost of revenue										18,591	15,480
Gross margin										(458)	(6,718)
Operating income										(458)	(6,718)
Income before income tax expense										(458)	(6,718)
Income tax expense (benefit)										8	(840)
Net income										$ (466)	$ (5,878)
Net income per weighted-average common and common-equivalent share:
Net income (in dollars per share)										$ 0.00	$ (0.04)
Net income (in dollars per share)										$ (0.01)	$ (0.03)