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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
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

Fair value of 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, elected not to be offset against an obligation to return collateral under a master netting arrangement.

+ References+ Details

- Definition

Fair value of 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, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References+ Details