CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ (75,738)	$ 131,762	$ 43,313
Unrealized gains (losses) on available-for-sale securities:
Unrealized (losses) gains during period, net of income taxes	(17)	(30)	(37)
Less: Reclassification adjustments for gains included to net income (loss), net of taxes			1
Net unrealized (losses) gains on available-for-sale securities	(17)	(30)	(38)
Comprehensive income (loss)	$ (75,755)	$ 131,732	$ 43,275