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)	$ (51,003)	$ 2,495	$ 54,455
Other comprehensive loss, net of tax
Unrealized loss on marketable securities	(245)	(98)	(18)
Comprehensive income (loss)	$ (51,248)	$ 2,397	$ 54,437