CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Net loss	$ (31,500)	$ (20,679)	$ (55,527)	$ (45,859)
Other comprehensive income (loss) before tax:
Unrealized (loss) gain arising during the period	0	(165)	0	158
Loss reclassified into earnings	0	22	0	100
Change in unrealized gain (loss) on cash flow hedges:	0	(143)	0	258
Unrealized (loss) gain arising during the period	(114)	(49)	(613)	30
Loss reclassified into earnings	0	0	0	1,476
Change in unrealized gain (loss) on available-for-sale securities:	(114)	(49)	(613)	1,506
Change in foreign currency translation adjustments	3,994	(2,611)	4,883	(677)
Other comprehensive income (loss) before tax	3,880	(2,803)	4,270	1,087
Less: Provision for (benefit from) income taxes	0	5	2	23
Other comprehensive income (loss), net of tax	3,880	(2,808)	4,268	1,064
Total comprehensive loss	$ (27,620)	$ (23,487)	$ (51,259)	$ (44,795)