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Risk Management and Derivative Instruments (Details 2) (Not designated as Hedging Instrument, Commodity Derivatives, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Risk Management and Derivative Instruments
Total derivative fair value at period end	$ 95,473	$ 126,709
Derivative assets:
Gross Recognized Assets	95,473	126,709
Net Recognized Fair Value Assets	95,473us-gaap_DerivativeAssets	126,709us-gaap_DerivativeAssets
Current Assets
Derivative assets:
Gross Recognized Assets	95,473	126,709
Net Recognized Fair Value Assets	95,473	126,709
Swaps \| Current Assets \| Oil
Derivative assets:
Gross Recognized Assets	79,344	106,450
Swaps \| Current Assets \| Gas
Derivative assets:
Gross Recognized Assets	$ 16,129	$ 20,259

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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