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Derivative Instruments - Commodity Derivative Gross and Net Information (Details) (Commodity Contract [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Commodity Contract [Member] |  |
Offsetting Assets [Line Items] |  |
Derivative assets, gross amounts of recognized assets | $ 22,743 | $ 68,970
Derivative assets, gross amounts offset in the balance sheet | (19,146) | (44,973)
Derivative assets, net amounts of assets presented in the balance sheet | 3,597 | 23,997
Derivative liabilities, gross amounts of recognized liabilities | 27,473 | 46,401
Derivative liabilities, gross amounts offset in the balance sheet | (19,146) | (44,973)
Derivative liabilities, net amounts of assets presented in the balance sheet | $ 8,327 | $ 1,428

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