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Derivative Financial Instruments Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair value of derivative assets and liabilities
Derivative Assets	$ 23,364	$ 37,873
Derivative asset	8,571	16,466
Derivative liability	22,836	8,999
Derivatives liability	12,669	6,645
Derivatives not designated as hedging instruments
Fair value of derivative assets and liabilities
Derivative Assets	23,364	37,873
Derivative asset	8,571	16,466
Derivative liability	22,836	8,999
Derivatives liability	12,669	6,645
Level 2 | Fair Value, Measurements, Recurring [Member] | Derivatives not designated as hedging instruments
Fair value of derivative assets and liabilities
Fair value: Derivative Assets	31,935	54,339
Fair value: Derivative Liabilities	$ 35,505	$ 15,644

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- Definition

Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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