ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accounts payable	$ 27,349	$ 20,422
Accruals for capital expenditures	1,244	139,904
Revenue and royalties payable	27,355	50,241
Accruals for operating expenses	25,131	21,830
Accrued interest	9,663	2,477
Derivative settlements	511	109
Other	1,716	12,456
Total accrued liabilities	65,620	227,017
Less: liabilities subject to compromise	(28,832)	0
Accounts payable and accrued liabilities	$ 64,137	$ 247,439