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Derivative Instruments and Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Effect of derivative instruments on the Consolidated Balance Sheet
Fair Value Asset	$ 954	$ 3,019
Fair Value Liability	38,493	13,912
Derivatives Designated as Hedges \| Commodity contracts \| Other current assets
Effect of derivative instruments on the Consolidated Balance Sheet
Fair Value Asset		3,019
Derivatives Designated as Hedges \| Commodity contracts \| Derivative instruments (current liabilities)
Effect of derivative instruments on the Consolidated Balance Sheet
Fair Value Liability		13,912
Derivatives Not Designated as Hedges \| Commodity contracts \| Other current assets
Effect of derivative instruments on the Consolidated Balance Sheet
Fair Value Asset	954
Derivatives Not Designated as Hedges \| Commodity contracts \| Derivative instruments (current liabilities)
Effect of derivative instruments on the Consolidated Balance Sheet
Fair Value Liability	$ 38,493

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.

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