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Derivatives and Hedging Activity (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2013
Derivatives And Hedging Activity (Textual) [Abstract]          
Cash flow hedge ineffectiveness in earnings materiality less than a  $1,000        
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense         $ 7,000,000
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (7,000) 86,000 291,000 36,000  
Fair value of derivatives in a net liability position 14,100,000   14,100,000    
Payment required to pay for contract termination $ 14,100,000   $ 14,100,000