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Financial Instruments: Derivatives and Hedging (Details) (USD $)
1 Months Ended 12 Months Ended
Feb. 28, 2011
Dec. 31, 2011
Financial Instruments: Derivatives and Hedging    
Payment to terminate interest rate swap   $ 983,000
Interest Rate Swap
   
Financial Instruments: Derivatives and Hedging    
Payment to terminate interest rate swap 983,000  
Interest amortization reclassified from accumulated other comprehensive income into interest expense   983,000
Effective portion of the loss on outstanding derivative recognized in Other Comprehensive Income   $ 983,000