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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 |

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