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Derivatives and Hedging Activity (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Offsetting Derivative Assets [Abstract]    
Gross Amounts of Recognized Assets $ 0 $ 2
Gross Amounts Offset in the Consolidated Balance Sheets 0 0
Net Amounts of Assets Presented in the Consolidated Balance Sheets 0 [1] 2 [1]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments 0 0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0 0
Net Amount 0 2
Offsetting Derivative Liabilities [Abstract]    
Gross Amounts of Recognized Liabilities 9,224 11,022
Gross Amounts Offset in the Consolidated Balance Sheets 0 0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets 9,224 [2] 11,022 [2]
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments 0 0
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0 0
Net Amount $ 9,224 $ 11,022
[1] Amounts reconcile to the aggregate fair value of derivative assets in the "Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet" located in this footnote.
[2] Amounts reconcile to the aggregate fair value of derivative liabilities in the "Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet" located in this footnote.