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Derivative Instruments; Fair Value (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Derivatives not designated as hedging instruments under Statement 133 Interest Rate Contracts Interest Rate Contracts Interest Rate Contracts Interest Rate Contracts
Location of Gain (Loss) Recognized in Income on Derivative Interest Expense Interest Expense Interest Income/(Expense) Interest Income/(Expense)
Amount of Gain (Loss) Recognized in Income on Derivative $ (10,000) [1] $ (179,000) $ (61,000) [1] $ (179,000)
[1] Interest on fixed/variable rate variances