EARNINGS PER SHARE - Calculation of Basic and Diluted Weighted Average Shares Outstanding and Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended	12 Months Ended
	Feb. 28, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Basic:
Net income (loss)		$ 1,297		$ (264,777)
Net income attributable to participating securities		(4)		0
Net income (loss) attributable to common stock - basic		1,293		(264,777)
Diluted:
Net income (loss)		1,297		(264,777)
Net income attributable to participating securities		(4)		0
Net income (loss) attributable to common stock - diluted		$ 1,293		$ (264,777)
Weighted average shares (denominator):
Weighted average shares - basic (in shares)		19,997		19,997
Dilutive effect of convertible notes (in shares)		0		0
Weighted average shares - diluted (in shares)		19,997		19,997
Basic income (loss) per share (in usd per share)		$ 0.06		$ (13.24)
Diluted income (loss) per share (in usd per share)		$ 0.06		$ (13.24)
Employee Stock Option
Weighted average shares (denominator):
Dilutive effect of stock options, warrants, and restricted stock units (in shares)		0		0
Warrants
Weighted average shares (denominator):
Dilutive effect of stock options, warrants, and restricted stock units (in shares)		0		0
Predecessor
Basic:
Net income (loss)	$ 630,317		$ (89,635)		$ (474,180)	$ (590,586)
Net income attributable to participating securities	(4,995)		0		0
Net income (loss) attributable to common stock - basic	625,322		(89,635)		(474,180)
Diluted:
Net income (loss)	630,317		(89,635)		(474,180)	$ (590,586)
Net income attributable to participating securities	(4,995)		0		0
Net income (loss) attributable to common stock - diluted	$ 625,322		$ (89,635)		$ (474,180)
Weighted average shares (denominator):
Weighted average shares - basic (in shares)	5,634		5,600		5,585
Dilutive effect of convertible notes (in shares)	0		0		0
Weighted average shares - diluted (in shares)	5,634		5,600		5,585
Basic income (loss) per share (in usd per share)	$ 110.99		$ (16.01)		$ (84.90)
Diluted income (loss) per share (in usd per share)	$ 110.99		$ (16.01)		$ (84.90)
Predecessor | Employee Stock Option
Weighted average shares (denominator):
Dilutive effect of stock options, warrants, and restricted stock units (in shares)	0		0		0
Predecessor | Warrants
Weighted average shares (denominator):
Dilutive effect of stock options, warrants, and restricted stock units (in shares)	0		0		0