Price-Risk Management Price-Risk Management (Details) $ in Millions	2 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($) MMBTU $ / MMBTU $ / Boe bbl	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Receivables for Settled Derivatives | $	$ 0.3
Payables for Settled Derivatives | $	(0.7)
Derivative, Fair Value, Net | $	(9.5)
Predecessor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Price Risk Derivatives, Net | $		$ (0.1)	$ 0.3
Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Price Risk Derivatives, Net | $	(9.9)
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset | $	0.1
Other Noncurrent Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset | $	0.1
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability | $	(8.0)
Other Noncurrent Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability | $	$ (1.7)
Swap [Member] | Commodity Contract [Member] | Third Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Portion of Future Oil and Gas Production Being Hedged | bbl	172,497
Swap [Member] | Commodity Contract [Member] | Fourth Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Portion of Future Oil and Gas Production Being Hedged | bbl	155,997
Swap [Member] | Commodity Contract [Member] | First Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Portion of Future Oil and Gas Production Being Hedged | bbl	106,245
Swap [Member] | Commodity Contract [Member] | Second Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Portion of Future Oil and Gas Production Being Hedged | bbl	97,401
Swap [Member] | Commodity Contract [Member] | Third Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Portion of Future Oil and Gas Production Being Hedged | bbl	90,000
Swap [Member] | Commodity Contract [Member] | Fourth Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Portion of Future Oil and Gas Production Being Hedged | bbl	84,798
Swap [Member] | Energy Related Derivative [Member] | Third Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	3,980,002
Swap [Member] | Energy Related Derivative [Member] | Fourth Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	5,250,003
Swap [Member] | Energy Related Derivative [Member] | First Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	3,975,000
Swap [Member] | Energy Related Derivative [Member] | Second Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	3,625,005
Swap [Member] | Energy Related Derivative [Member] | Third Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	3,339,999
Swap [Member] | Energy Related Derivative [Member] | Fourth Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	3,125,001
Swap [Member] | Other Contract [Member] | Third Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	3,979,902
Swap [Member] | Other Contract [Member] | Fourth Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	5,250,003
Swap [Member] | Other Contract [Member] | First Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	3,577,500
Swap [Member] | Other Contract [Member] | Second Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	3,262,506
Swap [Member] | Other Contract [Member] | Third Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	3,005,001
Swap [Member] | Other Contract [Member] | Fourth Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU	2,812,503
Minimum [Member] | Swap [Member] | Commodity Contract [Member] | Third Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	46.00
Minimum [Member] | Swap [Member] | Commodity Contract [Member] | Fourth Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	46.90
Minimum [Member] | Swap [Member] | Commodity Contract [Member] | First Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	47.25
Minimum [Member] | Swap [Member] | Commodity Contract [Member] | Second Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	47.25
Minimum [Member] | Swap [Member] | Commodity Contract [Member] | Third Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	47.25
Minimum [Member] | Swap [Member] | Commodity Contract [Member] | Fourth Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	47.25
Minimum [Member] | Swap [Member] | Energy Related Derivative [Member] | Third Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.30
Minimum [Member] | Swap [Member] | Energy Related Derivative [Member] | Fourth Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.67
Minimum [Member] | Swap [Member] | Energy Related Derivative [Member] | First Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.77
Minimum [Member] | Swap [Member] | Energy Related Derivative [Member] | Second Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.77
Minimum [Member] | Swap [Member] | Energy Related Derivative [Member] | Third Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.77
Minimum [Member] | Swap [Member] | Energy Related Derivative [Member] | Fourth Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.77
Minimum [Member] | Basis Swap [Member] | Other Contract [Member] | Third Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.05
Minimum [Member] | Basis Swap [Member] | Other Contract [Member] | Fourth Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.08
Minimum [Member] | Basis Swap [Member] | Other Contract [Member] | First Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.10
Minimum [Member] | Basis Swap [Member] | Other Contract [Member] | Second Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.05
Minimum [Member] | Basis Swap [Member] | Other Contract [Member] | Third Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.05
Minimum [Member] | Basis Swap [Member] | Other Contract [Member] | Fourth Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.05
Maximum [Member] | Swap [Member] | Commodity Contract [Member] | Third Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	49.48
Maximum [Member] | Swap [Member] | Commodity Contract [Member] | Fourth Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	50.36
Maximum [Member] | Swap [Member] | Commodity Contract [Member] | First Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	50.55
Maximum [Member] | Swap [Member] | Commodity Contract [Member] | Second Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	50.85
Maximum [Member] | Swap [Member] | Commodity Contract [Member] | Third Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	51.02
Maximum [Member] | Swap [Member] | Commodity Contract [Member] | Fourth Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price | $ / Boe	51.30
Maximum [Member] | Swap [Member] | Energy Related Derivative [Member] | Third Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.80
Maximum [Member] | Swap [Member] | Energy Related Derivative [Member] | Fourth Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.80
Maximum [Member] | Swap [Member] | Energy Related Derivative [Member] | First Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	3.09
Maximum [Member] | Swap [Member] | Energy Related Derivative [Member] | Second Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.85
Maximum [Member] | Swap [Member] | Energy Related Derivative [Member] | Third Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	2.91
Maximum [Member] | Swap [Member] | Energy Related Derivative [Member] | Fourth Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	3.03
Maximum [Member] | Basis Swap [Member] | Other Contract [Member] | Third Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.02
Maximum [Member] | Basis Swap [Member] | Other Contract [Member] | Fourth Quarter 2016 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.05
Maximum [Member] | Basis Swap [Member] | Other Contract [Member] | First Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.05
Maximum [Member] | Basis Swap [Member] | Other Contract [Member] | Second Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.02
Maximum [Member] | Basis Swap [Member] | Other Contract [Member] | Third Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.01
Maximum [Member] | Basis Swap [Member] | Other Contract [Member] | Fourth Quarter 2017 [Member] | Successor [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Swap Type, Fixed Price	0.04