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Financial Instruments: Derivatives and Hedging (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2011
Jun. 30, 2011
Jun. 30, 2011
Feb. 21, 2011
Dec. 31, 2010
Financial Instruments: Derivatives and Hedging          
Payment to terminate interest rate swap     $ 982,000    
Fair value measurements, recurring | Level 2 | Interest Rate Swap
         
Financial Instruments: Derivatives and Hedging          
Fair Value         (1,077,000)
Interest Rate Swap
         
Financial Instruments: Derivatives and Hedging          
Notional Value         75,000,000
Notional Value       75,000,000  
Strike Rate (as a percent)         5.84%
Payment to terminate interest rate swap 982,000        
Unamortized balance, terminated interest rate swap agreement payment   447,000 447,000    
Interest amortization reclassified from Accumulated Other Comprehensive Income into interest expense   381,000 536,000    
Effective portion of the loss on outstanding derivative recognized in Other Comprehensive Income   $ 381,000 $ 536,000