INCOME TAXES - Temporary Differences That Give Rise to Deferred Tax (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Reserves not currently deductible	$ 10,707	$ 19,249
Net operating loss carryforwards	110,773	122,420
Goodwill and intangibles (tax deductible)	12,757	25,268
Accrued expenses	95	467
Property basis differences	2,813	2,578
Stock based compensation	2,371	6,887
Other	0	638
Total deferred tax assets	139,516	177,507
Deferred tax liabilities:
Other	180	0
Less: valuation allowance	(138,238)	(179,788)
Net deferred tax asset	1,098
Net deferred tax liability		(2,281)
Deferred taxes	1,098
Deferred taxes	$ 0	$ (2,281)