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, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue
Revenue	$ 169,769	$ 183,325	$ 199,047	$ 173,484	$ 193,286	$ 232,221	$ 211,264	$ 169,567	$ 725,625	$ 806,338	$ 766,083
Cost of revenue									189,754	206,052	187,289
Gross margin	124,898	135,693	148,080	127,200	140,461	173,361	157,095	129,369	535,871	600,286	578,794
Operating income	17,607	43,092	51,756	30,147	45,247	77,844	63,455	34,596	142,602	221,142	258,861
Income before income tax expense									162,994	234,574	266,464
Income tax expense (benefit)									(40,871)	15,307	89,752
Net income	$ 80,327	$ 41,685	$ 48,749	$ 33,104	$ 45,418	$ 80,436	$ 56,196	$ 37,217	$ 203,865	$ 219,267	$ 176,712
Net income per weighted-average common and common-equivalent share:
Net income (in dollars per share)	$ 0.47	$ 0.24	$ 0.28	$ 0.19	$ 0.26	$ 0.47	$ 0.33	$ 0.21	$ 1.19	$ 1.27	$ 1.02
Diluted net income (loss) per share (in dollars per share)	$ 0.46	$ 0.24	$ 0.28	$ 0.19	$ 0.26	$ 0.45	$ 0.32	$ 0.21	$ 1.16	$ 1.24	$ 0.98
As previously reported
Revenue
Income before income tax expense									$ 162,994
Income tax expense (benefit)									(393,317)
Net income									$ 556,311
Net income per weighted-average common and common-equivalent share:
Net income (in dollars per share)									$ 3.25
Diluted net income (loss) per share (in dollars per share)									$ 3.17