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Derivative Financial Instruments Offsetting of Derivative Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Offsetting of Derivative Assets and Liabilities [Abstract]    
Document Period End Date Jun. 30, 2014  
Derivative Asset, Fair Value, Amount Offset Against Collateral $ 4,913 $ 52,510
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (4,913) (30,652)
Derivative Asset, Fair Value, Amount Offset Against Collateral, Net 0 21,858
Derivative Liability, Fair Value, Amount Offset Against Collateral (144,935) (31,020)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 4,913 30,652
Derivative Liability, Fair Value, Amount Offset Against Collateral, Net $ (140,022) $ (368)