INCOME TAXES - Reconciliation of Statutory to Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax benefit at statutory rate	$ 10,715	$ 23,654	$ 11,907
State tax benefit, net of federal taxes	1,510	4,587	1,398
Change in valuation allowance	(10,227)	41,550	(14,725)
Change in tax contingencies	0	10	66
Alternative minimum tax receivable	0	(925)	0
Corporate tax rate changes	0	(67,707)	0
Other	(2,566)	1,111	(661)
Tax benefit (expense)	$ (568)	$ 4,130	$ (2,015)