INCOME TAXES - Reconciliation of Statutory to Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Tax (benefit) provision at statutory rate	$ (113,736)	$ (48,554)	$ (24,633)
State tax (benefit) provision, net of federal taxes	(8,356)	(3,959)	(3,239)
Valuation allowance changes affecting income tax expense	57,023	63,641	29,805
Change in tax contingencies	(37)	(109)	(1,157)
Non-deductible transaction costs	0	0	317
Goodwill impairment	43,362	0	0
Other	212	174	167
Tax provision (benefit)	$ (21,532)	$ 11,193	$ 1,260