INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net Operating Loss (NOLs) and Tax Credit Carryforwards	$ 96,700	$ 174,865
Share Based Compensation	146	797
Accrued Interest	637	1,144
Allowance for Doubtful Accounts	1,279	1,360
Crude Oil and Natural Gas Properties and Other Properties	16,904	42,329
Interest Carryforwards	40,614	0
Derivative Instruments	(31,981)	7,393
Other	(145)	(140)
Total Net Deferred Tax Assets (Liabilities) Before Valuation Allowance	124,154	227,748
Valuation Allowance	(123,734)	(226,963)
Total Net Deferred Tax Assets	$ 420	$ 785