CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (3,465)	$ 44,869	$ 29,734
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	(1,466)	(1,690)	610
Net decrease in unrealized loss on investments	256	836	378
Total other comprehensive income (loss)	(1,210)	(854)	988
Total comprehensive income (loss)	$ (4,675)	$ 44,015	$ 30,722