CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (5,362)	$ 12,957	$ (26,455)	$ 30,946
Other comprehensive loss, net of tax
Foreign currency translation adjustment	(965)	(1,413)	(719)	(452)
Net decrease in unrealized loss on investments	8	42	256	241
Total other comprehensive loss	(957)	(1,371)	(463)	(211)
Total comprehensive income (loss)	$ (6,319)	$ 11,586	$ (26,918)	$ 30,735