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Derivatives - Open Commodity Derivative Contracts (Details) - January 2016 - December 2016
Mcf in Thousands
12 Months Ended
Dec. 31, 2015
$ / Mcf
$ / bbl
MBbls
Mcf
Oil price swaps  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) | MBbls 1,464
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) 88.36
Natural gas basis swaps  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) | Mcf 10,980
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf) | $ / Mcf (0.38)
Oil collars—three way  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Notional (Oil in MBbl/Natural Gas in MMcf) | MBbls 2,556
Oil collars—three way | Purchased Put  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Derivative, floor (USD/bbl) 90.00
Put | Oil collars—three way | Sold  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Derivative, floor (USD/bbl) 83.14
Call | Oil collars—three way | Sold  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Derivative, cap (USD/bbl) 100.85