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Derivative Financial Instruments Offsetting of Derivative Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Offsetting of Derivative Assets and Liabilities [Abstract]    
Derivative Asset, Fair Value, Amount Offset Against Collateral $ 21,336 $ 52,510
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (21,336) (30,652)
Derivative Asset, Fair Value, Amount Offset Against Collateral, Net 0 21,858
Derivative Liability, Fair Value, Amount Offset Against Collateral (68,569) (31,020)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 21,336 30,652
Derivative Liability, Fair Value, Amount Offset Against Collateral, Net $ (47,233) $ (368)