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Derivatives - Open Commodity Derivative Contracts (Details) - April 2016 - December 2016	3 Months Ended
	Mar. 31, 2016 $ / Mcf $ / bbl MBbls Mcf
Oil price swaps
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls	1,100
Weighted Avg. Fixed Price (Oil in USD/bbl, Natural Gas in USD/mcf)	88.36
Natural gas basis swaps
Derivative Instruments and Hedging Activities Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf) | Mcf	8,250
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 Disclosure
Notional (Oil in MBbls/Natural Gas in MMcf) | MBbls	1,646
Oil collars - three way | Sold | Put
Derivative Instruments and Hedging Activities Disclosure
Collar Range, minimum (in usd per mcf)	82.99
Oil collars - three way | Sold | Call
Derivative Instruments and Hedging Activities Disclosure
Collar Range, maximumCollar Range, minimum (in usd per mcf)	100.58
Oil collars - three way | Purchased | Put
Derivative Instruments and Hedging Activities Disclosure
Collar Range, minimum (in usd per mcf)	90.00

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Derivative Instruments and Hedging Activities Disclosure [Line Items]

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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Nominal volume used to calculate payments on a derivative instrument.

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Average fixed price related to the group of price risk swap derivatives.

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