Supplemental Oil & Natural Gas Data (Unaudited) Change in Standardized Measure of Discounted Net Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 16, 2013
Predecessor
Change in Discounted Future Net Cash Flows Relating to Proved Oil and Natural Gas Reserves
Standardized measure—beginning of year				$ 3,833,415
Sales and transfers of oil, natural gas and NGL produced during the period				(703,597)
Changes in estimated future development costs				20,932
Net change in sales and transfer prices and production costs related to future production				(214,489)
Extensions, discoveries and improved recovery				189,625
Sales of minerals in place				(13,279)
Previously estimated development costs incurred during the period				401,791
Net change due to revisions in quantity estimates				(856,118)
Accretion of discount				496,718
Income taxes				237,117
Changes in production rates and other				166,480
Net increase (decrease)				(274,820)
Standardized measure—end of year				$ 3,558,595
Successor
Change in Discounted Future Net Cash Flows Relating to Proved Oil and Natural Gas Reserves
Standardized measure—beginning of year	$ 3,558,595	$ 4,330,377	$ 4,635,332
Sales and transfers of oil, natural gas and NGL produced during the period	(30,208)	(207,125)	(794,337)
Changes in estimated future development costs	0	431,622	68,290
Net change in sales and transfer prices and production costs related to future production	(1,272)	(3,203,620)	(1,020,605)
Extensions, discoveries and improved recovery	0	20,345	674,392
Purchases of minerals in place		0	548,256
Sales of minerals in place	0	0	(486,903)
Previously estimated development costs incurred during the period	0	67,529	269,473
Net change due to revisions in quantity estimates	0	(544,334)	(66,696)
Accretion of discount	19,184	433,038	463,533
Income taxes	1,109,522
Changes in production rates and other	(20,489)	(332,460)	39,642
Net increase (decrease)	1,076,737	(3,335,005)	(304,955)
Standardized measure—end of year	$ 4,635,332	$ 995,372	$ 4,330,377

Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 35
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Amount of decrease in standardized measure of discounted future net cash flow as a result of sales of minerals in place.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in estimated future development costs.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in the estimated future income tax on future pretax net cash flows related to the entity's proved oil and gas reserves.

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Amount of increase in standardized measure of discounted future net cash flow as a result of purchases of minerals in place.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in sales and transfer prices and in production (lifting) costs related to future production.

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Amount of increase in standardized measure of discounted future net cash flow as a result of previously estimated development costs incurred.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of revisions of estimated quantity of oil and gas in proved reserves.

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Amount of (increase) decrease in standardized measure of discounted future net cash flow as a result of sales and transfers of oil and gas produced.

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Amount of discounted future accumulated cash inflow relating to proved oil and gas reserves.

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