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Derivative Financial Instruments (Details 1) (Interest Rate Contracts One [Member], Derivative in cash flow hedging relationship [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Interest Rate Contracts One [Member] | Derivative in cash flow hedging relationship [Member]
   
Effect of the derivative instruments on the consolidated statement of income Derivative in cash flow hedging relationship    
Comprehensive Income on Derivative $ 285 $ 367