CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net loss	$ (72,314)	$ (15,661)	$ (46,248)
Other comprehensive income (loss), before tax:
Unrealized gains (losses), net arising during the period	202	(133)	311
Losses (gains) reclassified into earnings	44	(424)	0
Other Comprehensive Income (Loss) before tax, Cash Flow Hedges	246	(557)	311
Unrealized losses, net arising during the period	(903)	(785)	(815)
Losses reclassified into earnings	2,735
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	1,832	(785)	(815)
Adjustment to pension benefit plan	(279)
Change in foreign currency translation adjustments	(4,633)	(1,111)	(1,281)
Other comprehensive loss before tax	(2,834)	(2,453)	(1,785)
Provision for (benefit from) income taxes	18	(15)	(14)
Other comprehensive loss, net of tax	(2,852)	(2,438)	(1,771)
Total comprehensive loss	$ (75,166)	$ (18,099)	$ (48,019)