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Price-Risk Management Price-Risk Management (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
MMBTU
$ / MMBTU
$ / Boe
bbl
Mar. 31, 2016
USD ($)
Dec. 31, 2016
MMBTU
$ / MMBTU
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Receivables for Settled Derivatives | $ $ 100    
Payables for Settled Derivatives | $ 500    
Derivative, Fair Value, Net | $ 5,600    
Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (Loss) on Price Risk Derivatives, Net | $ 10,900    
Derivative, Cash Received on Hedge | $ 800    
Predecessor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (Loss) on Price Risk Derivatives, Net | $   $ 0  
Other Current Assets [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative Asset, Fair Value, Gross Asset | $ 900    
Other Noncurrent Assets [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative Asset, Fair Value, Gross Asset | $ 100    
Other Current Liabilities [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative Liability, Fair Value, Gross Liability | $ 6,300    
Other Noncurrent Liabilities [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative Liability, Fair Value, Gross Liability | $ $ 300    
Swap [Member] | Oil Derivative Swaps [Member] | First Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 17,000    
Derivative, Swap Type, Fixed Price | $ / Boe 50.25    
Swap [Member] | Oil Derivative Swaps [Member] | Second Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 16,100    
Derivative, Swap Type, Fixed Price | $ / Boe 50.15    
Swap [Member] | Oil Derivative Swaps [Member] | Third Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 15,100    
Derivative, Swap Type, Fixed Price | $ / Boe 50.20    
Swap [Member] | Oil Derivative Swaps [Member] | Fourth Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Portion of Future Oil and Gas Production Being Hedged | bbl 14,200    
Derivative, Swap Type, Fixed Price | $ / Boe 50.10    
Swap [Member] | Oil Derivative Swaps [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    
Derivative, Swap Type, Fixed Price | $ / Boe 48.13    
Swap [Member] | Oil Derivative Swaps [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    
Derivative, Swap Type, Fixed Price | $ / Boe 48.16    
Swap [Member] | Oil Derivative Swaps [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    
Derivative, Swap Type, Fixed Price | $ / Boe 48.18    
Swap [Member] | Natural Gas Derivative Swaps [Member] | First Quarter 2019 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Swap Type, Fixed Price 3.10    
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 875,000    
Swap [Member] | Natural Gas Derivative Swaps [Member] | First Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Swap Type, Fixed Price 3.45    
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 6,084,000    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Second Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Swap Type, Fixed Price 2.83    
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 2,776,000    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Third Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Swap Type, Fixed Price 2.85    
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 2,574,000    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Swap Type, Fixed Price 2.93    
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 2,388,000    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Second Quarter 2017 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Swap Type, Fixed Price 2.98    
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 4,153,170    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Third Quarter 2017 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Swap Type, Fixed Price 3.01    
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 6,014,999    
Swap [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2017 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, Swap Type, Fixed Price 2.97    
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 4,460,001    
Forward Contracts [Member] | Natural Gas Derivative Swaps [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     1,600,000
Derivative, Average Floor Price     3.050
Derivative, Average Cap Price     3.545
Forward Contracts [Member] | Natural Gas Derivative Swaps [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     2,865,000
Derivative, Average Floor Price     3.050
Derivative, Average Cap Price     3.585
Forward Contracts [Member] | Natural Gas Derivative Swaps [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     3,102,000
Derivative, Average Floor Price     3.100
Derivative, Average Cap Price     3.715
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | First Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 4,950,000    
Derivative, Basis Swap Type, Fixed Price (0.12)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Second Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 910,000    
Derivative, Basis Swap Type, Fixed Price (0.11)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Third Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 920,000    
Derivative, Basis Swap Type, Fixed Price (0.11)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Fourth Quarter 2018 [Member] | Successor [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Future Gas Production Hedged in MMBtu (Energy Item Type) | MMBTU 920,000    
Derivative, Basis Swap Type, Fixed Price (0.11)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [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 5,753,170    
Derivative, Basis Swap Type, Fixed Price (0.04)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [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 7,969,999    
Derivative, Basis Swap Type, Fixed Price (0.02)    
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [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 7,562,001    
Derivative, Basis Swap Type, Fixed Price (0.04)