DERIVATIVES (Effect Of Derivative Instruments In The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 08, 2018	Dec. 31, 2018	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on derivatives	$ 6,663	$ (10,247)	$ (11,744)
Derivatives Not Designated As Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on derivatives	6,663	(10,247)	(11,744)
Derivatives Not Designated As Hedging Instruments | Oil commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on derivatives	4,796	(3,559)	(16,013)
Derivatives Not Designated As Hedging Instruments | Natural gas commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total gain (loss) on derivatives	$ 1,867	$ (6,688)	$ 4,269