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Derivative Financial Instruments - Effect of Derivative Financial Instruments on Income Statement (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Not Designated as Hedging Instrument | Interest rate contracts | Other Income
       
Derivative [Line Items]        
Amount of Gain (Loss) Recognized Income on Derivative $ 200 $ (58) $ 266 $ (55)
Designated as Hedging Instrument | Cash Flow Hedging | Interest expense
       
Derivative [Line Items]        
Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion) (192)   (380)  
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate contracts
       
Derivative [Line Items]        
Amount of Gain Recognized in Ohter Comprehensive Income on Derivative (Effective Portion) $ 1,501 $ (1,621) $ 1,798 $ (1,153)