CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
Net (loss) income	$ (21,653)	$ 12,746	$ (33,286)	$ 30,684
Unrealized gains (losses) on available-for-sale securities:
Unrealized gains (losses) during period, net of taxes	(17)	(1)	5	(11)
Net unrealized gains (losses) on available-for-sale securities	(17)	(1)	5	(11)
Comprehensive (loss) income	$ (21,670)	$ 12,745	$ (33,281)	$ 30,673