SUPPLEMENTAL INFORMATION ON OIL AND NATURAL GAS OPERATIONS - UNAUDITED - Summary of Standardized Measure of Discounted Future Net Cash Flows (Details) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Feb. 28, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) $ / bbl	Mar. 31, 2017 $ / bbl $ / Mcf	Mar. 01, 2017 $ / bbl $ / Mcf	Dec. 31, 2016 USD ($) $ / bbl $ / Mcf	Dec. 31, 2015 USD ($) $ / bbl $ / Mcf
Standardized Measure Of Discounted Future Net Cash Flows [Line Items]
Future cash inflows					$ 1,264,809
Future production costs					(497,538)
Future development costs					(431,752)
Future income taxes					0
Future net cash flows					335,519
10% annual discount					57,591
Standardized measure of discounted future net cash flows	$ 303,086	$ 393,110			$ 393,110
Proved Reserves Average Prices [Abstract]
Average 12-month oil prices net of differentials (in usd per Bbl) | $ / bbl					50.05	45.40	56.01
Average 12-month natural gas liquids prices net of differentials (in usd per Bbl) | $ / bbl								22.90
Average 12-month gas prices net of differentials (in usd per Mcf) | $ / Mcf						2.24	2.52	2.34
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Standardized measure at beginning of period		303,086
Sales and transfers of oil, natural gas and NGLs produced, net of production costs		(164,612)
Changes in price, net of future production costs		66,192
Extensions and discoveries, net of future production and development costs		0
Changes in estimated future development costs, net of development costs incurred during the period		88,111
Revisions of quantity estimates		96,454
Accretion of discount		30,309
Net change in income taxes		0
Purchases of reserves in-place		0
Sales of reserves in-place		0
Changes in production rates due to timing and other		(26,430)
Net change in standardized measure		90,024
Standardized measure at end of period	303,086	393,110
Predecessor
Standardized Measure Of Discounted Future Net Cash Flows [Line Items]
Future cash inflows								$ 1,236,097	$ 1,921,329
Future production costs								(480,815)	(651,396)
Future development costs								(638,988)	(679,355)
Future income taxes								0	0
Future net cash flows								116,294	590,578
10% annual discount								109,628	13,259
Standardized measure of discounted future net cash flows	225,922	303,086	$ 603,837	$ 1,418,792				$ 225,922	$ 603,837
Proved Reserves Average Prices [Abstract]
Average 12-month oil prices net of differentials (in usd per Bbl) | $ / bbl								40.15	51.16
Average 12-month natural gas liquids prices net of differentials (in usd per Bbl) | $ / bbl								9.46	16.40
Average 12-month gas prices net of differentials (in usd per Mcf) | $ / Mcf								1.71	2.19
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Standardized measure at beginning of period	225,922	$ 303,086	603,837	1,418,792
Sales and transfers of oil, natural gas and NGLs produced, net of production costs	(46,137)		(223,948)	(340,477)
Changes in price, net of future production costs	17,455		(448,861)	(237,747)
Extensions and discoveries, net of future production and development costs	0		5,243	1,573
Changes in estimated future development costs, net of development costs incurred during the period	20,756		54,406	731,115
Revisions of quantity estimates	36,557		139,759	(1,458,652)
Accretion of discount	22,592		60,384	174,456
Net change in income taxes	0		0	325,768
Purchases of reserves in-place	0		0	3,493
Sales of reserves in-place	14,584		0	0
Changes in production rates due to timing and other	11,357		35,102	(14,484)
Net change in standardized measure	77,164		(377,915)	(814,955)
Standardized measure at end of period	$ 303,086		$ 225,922	$ 603,837