INCOME TAXES - Components of Net Income Before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Income (loss) before provision for income taxes	$ (12,994)	$ 144,339	$ (25,512)	$ (366)	$ (29,027)	$ (17,980)	$ 9,280	$ (75,671)	$ 105,467	$ (113,398)	$ (34,549)
United States
Operating Loss Carryforwards [Line Items]
Income (loss) before provision for income taxes									107,038	(112,558)	(34,549)
Foreign
Operating Loss Carryforwards [Line Items]
Income (loss) before provision for income taxes									$ (1,571)	$ (840)	$ 0