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Financial Instruments: Derivatives and Hedging (Details) (USD $)
1 Months Ended3 Months Ended9 Months Ended
Feb. 28, 2011
Sep. 30, 2011
Sep. 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 swap982,000    
Unamortized balance, terminated interest rate swap agreement payment 63,00063,000  
Interest amortization reclassified from Accumulated Other Comprehensive Income into interest expense 385,000921,000  
Effective portion of the loss on outstanding derivative recognized in Other Comprehensive Income $ 385,000$ 921,000