Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Net income (loss)	$ (32,338)	$ 44,462	$ (8,660)
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	(8,592)	(8,178)	2,505
Unrealized gains on marketable securities:
Unrealized holding gains arising during the period	0	0	1
Less: Reclassification adjustments for gains included in net income	0	0	(3)
Unrealized losses on marketable securities, net	0	0	(2)
Other comprehensive income (loss), before tax	(8,592)	(8,178)	2,503
Income tax benefit related to components of other comprehensive loss	0	0	1
Other comprehensive income (loss), net of tax	(8,592)	(8,178)	2,504
Comprehensive income (loss)	$ (40,930)	$ 36,284	$ (6,156)