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Derivative Financial Instruments (Details)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
MMBTU
gal
bbl
Sep. 30, 2015
USD ($)
MMBTU
gal
bbl
Sep. 30, 2015
USD ($)
MMBTU
gal
bbl
Commodity contracts | Derivative instruments not designated as hedging instruments      
Derivative financial instruments      
Notional quantity of Crude Oil contracts (in Bbl) | bbl 201,800 201,800 201,800
Notional quantity of Natural Gas contracts (in MMBtu) | MMBTU 375,385 375,385 375,385
Notional quantity of NGL contracts (in Gal) | gal 80,351,908 80,351,908 80,351,908
Embedded derivatives in commodity contracts | Embedded derivative in gas processing and purchase contract      
Derivative financial instruments      
Notional amount for embedded derivative in commodity contract (in Dth per day) 9,000 9,000 9,000
Term of producer's option to renew gas purchase agreement     5 years
Inception value deemed to have settled $ 2,500 $ 5,100  
Fair value of commodity contract (27,352) (27,352) $ (27,352)
Inception value for period from October 1, 2015 to December 31, 2022 (48,407) (48,407) (48,407)
Derivative asset (liability) as of September 30, 2015 21,055 21,055 21,055
Embedded derivatives in commodity contracts | Embedded derivative in electricity purchase contract      
Derivative financial instruments      
Derivative asset (liability) as of September 30, 2015 $ (600) $ (600) $ (600)