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Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets [Abstract]
Fixed Price Derivative contracts	$ 113	$ 1,010
Liabilities [Abstract]
Fixed Price Derivative contracts	12,103	5,002
Recurring Basis [Member]
Assets [Abstract]
Fixed Price Derivative contracts	113	1,010
Total Assets	113	1,010
Liabilities [Abstract]
Fixed Price Derivative contracts	12,103	5,002
Total Liabilities	12,103	5,002
Recurring Basis [Member] \| Significant Other Observable Inputs (Level 2)
Assets [Abstract]
Fixed Price Derivative contracts	113	1,010
Total Assets	113	1,010
Liabilities [Abstract]
Fixed Price Derivative contracts	12,103	5,002
Total Liabilities	$ 12,103	$ 5,002

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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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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.

+ References+ Details