Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 998,532
Other comprehensive income (loss)	$ 48	$ (164)	121	$ (38)
Balance, end of period	831,635		831,635
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(477)
Other comprehensive income (loss) before reclassifications			(20,582)
Amounts reclassified from AOCI			8,264
Other comprehensive income (loss)			(12,318)
Balance, end of period	(12,795)		(12,795)
Currency Translation Adjustments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(314)
Other comprehensive income (loss) before reclassifications			314
Amounts reclassified from AOCI			0
Other comprehensive income (loss)			314
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			(187)
Other comprehensive income (loss) before reclassifications			133
Amounts reclassified from AOCI			(12)
Other comprehensive income (loss)			121
Balance, end of period	(66)		(66)
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(978)
Other comprehensive income (loss) before reclassifications			(20,135)
Amounts reclassified from AOCI			8,252
Other comprehensive income (loss)			(11,883)
Balance, end of period	$ (12,861)		$ (12,861)