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Derivatives and Hedging Activity (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Effect of derivative instruments on the Consolidated Statements of Operations    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total $ 1,937 $ 1,855
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total (2) 298
Cash Flow Hedging [Member]
   
Effect of derivative instruments on the Consolidated Statements of Operations    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total (92) (1,959)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total (1,937) (1,855)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net, Total 0 0
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total (2) 298
Interest Rate Products [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]
   
Effect of derivative instruments on the Consolidated Statements of Operations    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total (92) (1,959)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total (1,937) (1,855)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net, Total $ 0 $ 0