CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Net loss	$ (15,583)	$ (16,012)	$ (71,110)	$ (61,871)
Other comprehensive income (loss) before tax:
Unrealized gain arising during the period	0	121	0	279
(Gain) loss reclassified into earnings	0	(47)	0	53
Change in unrealized gain on cash flow hedges:	0	74	0	332
Unrealized (loss) gain arising during the period	8	(1,208)	(605)	(1,178)
Loss reclassified into earnings	0	1,259	0	2,735
Change in unrealized gain (loss) on available-for-sale securities:	8	51	(605)	1,557
Change in foreign currency translation adjustments	2,265	523	7,147	(154)
Other comprehensive income before tax	2,273	648	6,542	1,735
Less: Provision for (benefit from) income taxes	0	(3)	2	20
Other comprehensive income, net of tax	2,273	651	6,540	1,715
Total comprehensive loss	$ (13,310)	$ (15,361)	$ (64,570)	$ (60,156)