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Derivatives (Effect of Derivative Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative [Line Items]                      
Interest Income / (Expense) $ 18,388 $ 17,192 $ 16,712 $ 16,225 $ 16,594 $ 16,393 $ 16,649 $ 16,612 $ 68,517 $ 66,248 $ 63,981
Interest Rate Swap [Member]
                     
Derivative [Line Items]                      
Interest Income / (Expense)                         
Other Income / (Expense)                 $ 528 $ 163