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Derivative Financial Instruments (Details 1) (Derivatives Not Designated as Hedging Instruments [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
The Effect of Derivative Instruments on the Consolidated Statement of Earnings        
Derivative Instruments, Gain Recognized in Income $ 189 $ 47 $ 692 $ 148
Interest Rate Swaps [Member] | Other Income [Member]
       
The Effect of Derivative Instruments on the Consolidated Statement of Earnings        
Derivative Instruments, Gain Recognized in Income $ 189 $ 47 $ 692 $ 148