Supplemental Oil & Natural Gas Data (Unaudited) Results of Oil and Natural Gas Producing Activities (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 16, 2013
Successor
Revenues and other:
Oil, natural gas and natural gas liquids sales	$ 50,324	$ 575,031	$ 1,298,402
Gains (losses) on oil and natural gas derivatives	(5,049)	29,175	78,784
Total revenue from oil and gas producing activities	45,275	604,206	1,377,186
Production costs:
Lease operating expenses	15,410	245,155	364,540
Transportation expenses	2,576	52,160	41,842
Severance taxes, ad valorem taxes and California carbon allowances	2,130	70,591	97,683
Results of Operations, Expense from Oil and Gas Producing Activities	20,116	367,906	504,065
Other costs:
Exploration costs	0	0	0
Depletion and amortization	10,612	241,019	294,107
Impairment of long-lived assets	0	853,810	253,362
(Gains) losses on sale of assets and other, net	10,208	372	112,303
Total other costs	20,820	1,095,201	659,772
Income tax expense (benefit)	0	(68)	69
Results of operations	4,339	(858,833)	213,280
Predecessor
Revenues and other:
Oil, natural gas and natural gas liquids sales				$ 1,103,245
Gains (losses) on oil and natural gas derivatives				(34,711)
Total revenue from oil and gas producing activities				1,068,534
Production costs:
Lease operating expenses				295,811
Transportation expenses				46,774
Severance taxes, ad valorem taxes and California carbon allowances				57,063
Results of Operations, Expense from Oil and Gas Producing Activities				399,648
Other costs:
Exploration costs				24,048
Depletion and amortization				275,927
Impairment of long-lived assets				0
(Gains) losses on sale of assets and other, net				(23)
Total other costs				299,952
Income tax expense (benefit)				65,280
Results of operations				$ 303,654
Federal Tax | Successor
Other costs:
Income tax expense (benefit)	$ 0	$ 0	$ 0