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Derivative Financial Instruments (Details 3) (Interest rate swaps, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Interest rate swaps
   
Offsetting of financial assets and derivative assets    
Gross Amounts of Recognized Assets $ 11,586 $ 17,422
Gross Amounts Offset in the Statement of Financial Position 684 1,296
Net Amounts of Assets Presented in the Statement of Financial Position 10,902 16,126
Net Amount $ 10,902 $ 16,126