Stockholders' Equity - Reclassified from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Amounts Reclassified from AOCI
Provision (benefit) for income taxes	$ 4,371	$ 1,970
Net income	26,405	15,426
Reclassifications From Accumulated Other Comprehensive Income (Loss)
Amounts Reclassified from AOCI
Income (loss) before income taxes	49	(1,808)
Provision (benefit) for income taxes	10	(633)
Net income	(39)	1,175
Losses on available-for-sales securities | Reclassifications From Accumulated Other Comprehensive Income (Loss)
Amounts Reclassified from AOCI
Interest income and other, net	$ (49)
Gains on cash flow hedges | Reclassifications From Accumulated Other Comprehensive Income (Loss)
Amounts Reclassified from AOCI
Interest expense		$ 1,808