Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (80,877)	$ (60,079)
Cash flow hedges:
Change in unrealized gain (loss) on cash flow hedges, net of tax benefit (expense) of $0 and $(202), respectively	664	(1,160)
Less: reclassification for realized net gains included in net income, net of tax expense (benefit) of $0 and $(38), respectively	0	217
Net change, net of tax	664	(943)
Change in foreign currency translation adjustment	0	(271)
Change in unrealized loss on available-for-sale investments, net of tax	(326)	76
Less reclassification for realized net gains	0	(9)
Net change, net of tax	(326)	67
Comprehensive loss	$ (80,539)	$ (61,226)