SUPPLEMENTAL INFORMATION ON OIL AND NATURAL GAS OPERATIONS - UNAUDITED - Amortization of Investment in Oil and Gas Properties (Details) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended							10 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($)	Feb. 28, 2017 USD ($) $ / bbl	Dec. 31, 2017 USD ($) $ / bbl	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($) $ / bbl	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) $ / bbl	Dec. 31, 2017 USD ($) $ / bbl	Dec. 31, 2016 USD ($) $ / bbl	Dec. 31, 2015 USD ($) $ / bbl
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Depreciation, depletion and amortization										$ 99,890
Write-down of oil and gas properties	$ 256,435		$ 0	$ 0	$ 0					$ 256,435
DD&A per Boe | $ / bbl			16.61							16.61	16.61
United States
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Depreciation, depletion and amortization										$ 97,027
Write-down of oil and gas properties										$ 256,435
Predecessor
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Depreciation, depletion and amortization		$ 37,429										$ 220,079	$ 281,688
Write-down of oil and gas properties		0				$ 73,094	$ 36,484	$ 118,649	$ 129,204			357,431	1,362,447
Predecessor | United States
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Depreciation, depletion and amortization		$ 36,751										215,737	277,088
Write-down of oil and gas properties											$ 0	$ 357,079	$ 1,314,817
DD&A per Boe | $ / bbl		17.05				16.10						16.10	19.15