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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ (44,793)	$ (122,210)	$ (31,978)
Available-for-sale securities:
Change in net unrealized gains or losses	(7)	(6)	(49)
Reclassification adjustments for net (gains) losses included in net loss		18
Net unrealized gain (loss) on available-for-sale securities	(7)	12	(49)
Minimum pension liability:
Change in minimum pension liability			15
Reclassification adjustments for net (gains) losses included in net loss		866
Net changes related to minimum pension liability		866	15
Currency translation adjustments:
Change in currency translation adjustments	42	(19)	(87)
Reclassification adjustments for net (gains) losses included in net loss		(430)
Net changes related to currency translation adjustments	42	(449)	(87)
Other comprehensive income (loss), net of tax	35	429	(121)
Total comprehensive income (loss)	$ (44,758)	$ (121,781)	$ (32,099)

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