Supplemental Oil & Natural Gas Data (Unaudited) Results of Oil and Natural Gas Producing Activities (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 16, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 16, 2013	Dec. 31, 2012
Results of Operations for Oil and Gas Producing Activities
Federal Income Tax Expense (Benefit), Continuing Operations	$ 0	$ 0
Successor
Revenues and other:
Oil, natural gas and natural gas liquids sales	50,324	1,298,402	254,043	350,863	360,380	333,116
Gains (losses) on oil and natural gas derivatives	(5,049)	78,784	55,891	44,990	(25,562)	3,465
Total revenue from oil and gas producing activities	45,275	1,377,186
Production costs:
Lease operating expenses	15,410	364,540
Transportation expenses	2,576	41,842
Severance taxes, ad valorem taxes and California carbon allowances	2,130	97,683
Total production costs	20,116	504,065
Other costs:
Exploration costs	0	0
Depletion and amortization	10,612	294,107
Impairment of long-lived assets	0	253,362
(Gains) losses on sale of assets and other, net	10,208	112,303
Total other costs	20,820	659,772
Income tax expense	0	69
Results of operations	4,339	213,280
Predecessor
Revenues and other:
Oil, natural gas and natural gas liquids sales							255,575	306,183	274,715	266,772	1,103,245	937,261
Gains (losses) on oil and natural gas derivatives							(24,303)	(45,293)	35,622	(737)	(34,711)	64,620
Total revenue from oil and gas producing activities											1,068,534	1,001,881
Production costs:
Lease operating expenses											295,811	232,266
Transportation expenses											46,774	39,531
Severance taxes, ad valorem taxes and California carbon allowances											57,063	39,374
Total production costs											399,648	311,171
Other costs:
Exploration costs											24,048	21,010
Depletion and amortization											275,927	224,836
Impairment of long-lived assets											0	0
(Gains) losses on sale of assets and other, net											(23)	(1,782)
Total other costs											299,952	244,064
Income tax expense											65,280	88,121
Results of operations											$ 303,654	$ 358,525