DERIVATIVES - DERIVATIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended				4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Apr. 28, 2017	Sep. 30, 2017	Sep. 30, 2016
Predecessor
Components of the derivative loss
Total derivative gain (loss)			$ 2,206		$ 0		$ (11,724)
Predecessor | Commodity derivative
Components of the derivative loss
Derivative cash settlement gain				$ 4,348	0		15,749
Change in fair value loss				(2,142)	0		(27,473)
Total derivative gain (loss)				2,206	0		(11,724)
Predecessor | Commodity derivative | Oil contracts
Components of the derivative loss
Derivative cash settlement gain				4,348	0		15,749
Predecessor | Commodity derivative | Gas contracts
Components of the derivative loss
Derivative cash settlement gain				$ 0	$ 0		$ 0
Successor
Components of the derivative loss
Total derivative gain (loss)	$ (2,762)					$ (2,762)
Successor | Commodity derivative
Components of the derivative loss
Derivative cash settlement gain		$ 0				0
Change in fair value loss		(2,762)				(2,762)
Total derivative gain (loss)		$ (2,762)				(2,762)
Successor | Commodity derivative | Oil contracts
Components of the derivative loss
Derivative cash settlement gain	0					0
Successor | Commodity derivative | Gas contracts
Components of the derivative loss
Derivative cash settlement gain	$ 0					$ 0