Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 823,963
Net change, net of tax	$ 130	$ 6	(196)	$ 73
Balance, end of period	678,959		678,959
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(9)
Other comprehensive income (loss) before reclassifications			5,704
Amounts reclassified from AOCI			(1,016)
Net change, net of tax			4,688
Balance, end of period	4,679		4,679
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			66
Other comprehensive income (loss) before reclassifications			5,912
Amounts reclassified from AOCI			(1,028)
Net change, net of tax			4,884
Balance, end of period	4,950		4,950
Currency Translation Adjustments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			0
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified from AOCI			0
Net change, net of tax			0
Balance, end of period	0		0
Unrealized Gains (Losses) on Available-for-Sale Investments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(75)
Other comprehensive income (loss) before reclassifications			(208)
Amounts reclassified from AOCI			12
Net change, net of tax			(196)
Balance, end of period	$ (271)		$ (271)