Supplemental Oil & Natural Gas Data (Unaudited) Standardized Measure of Discounted Future Net Cash Flows (Details) $ in Thousands		Dec. 31, 2015 USD ($) $ / boe $ / MMBtu	Dec. 31, 2014 USD ($) $ / boe $ / MMBtu	Dec. 31, 2013 USD ($) $ / boe $ / MMBtu	Dec. 17, 2013 USD ($)	Dec. 16, 2013 USD ($)	Dec. 31, 2012 USD ($)
Successor
Discounted Future Net Cash Flows Relating to Proved Oil and Natural Gas Reserves
Future estimated revenues		$ 5,483,899	$ 16,844,678	$ 17,863,984
Future estimated production costs		(3,458,415)	(7,742,035)	(6,654,536)
Future estimated development costs		(332,311)	(1,132,807)	(1,854,849)
Future net cash flows		1,693,173	7,969,836	9,354,599
10% annual discount for estimated timing of cash flows		(697,801)	(3,639,459)	(4,719,267)
Standardized measure of discounted future net cash flows		$ 995,372	$ 4,330,377	$ 4,635,332	$ 3,558,595
Successor | Crude Oil [Member]
Representative NYMEX prices: (1)
Oil (Bbl) | $ / boe	[1]	50.16	95.27	96.89
Successor | Natural gas ($/Mcf)
Representative NYMEX prices: (1)
Natural gas (MMBtu) | $ / MMBtu	[1]	2.59	4.35	3.67
Predecessor
Discounted Future Net Cash Flows Relating to Proved Oil and Natural Gas Reserves
Standardized measure of discounted future net cash flows						$ 3,558,595	$ 3,833,415

[1] In accordance with SEC regulations, reserves were estimated using the average price during the 12-month period, determined as an unweighted average of the first-day-of-the-month price for each month, excluding escalations based upon future conditions. The average price used to estimate reserves is held constant over the life of the reserves.