INCOME TAXES - Reconciliation of Statutory to Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax (benefit) at statutory rate	$ (11,275)	$ (113,736)	$ (48,554)
State tax (benefit), net of federal taxes	(1,322)	(8,356)	(3,959)
Valuation allowance changes affecting income tax expense	14,017	57,023	63,641
Change in tax contingencies	(66)	(37)	(109)
Goodwill impairment	0	43,362	0
Other	661	212	174
Tax provision (benefit)	$ 2,015	$ (21,532)	$ 11,193