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Derivative Financial Instruments (Details 3) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2013
Derivative financial instruments related to unconsolidated joint venture          
Number of derivative agreements for which the Parent Company could be liable in event of default by a subsidiary     1    
Interest rate derivatives | Cash flow hedges
          
Derivative Financial Instruments          
Amount of (loss) recognized on derivatives in Other Comprehensive (Loss) $ (251,000) $ (687,000) $ (901,000) $ (977,000)  
Amount of (loss) reclassified from Accumulated Other Comprehensive (Loss) into Interest Expense (133,000) (92,000) (371,000) (253,000)  
Reclassification of gain (loss)          
Additional amount to be reclassified to interest expense during the next twelve months         523,000
Credit risk related contingent feature          
Fair value of derivative including accrued interest but excluding adjustments for nonperformance risk 1,572,000   1,572,000    
Termination value of derivative agreement 1,572,000   1,572,000    
Interest rate derivatives | Cash flow hedges | Unconsolidated joint ventures
          
Derivative Financial Instruments          
Amount of (loss) recognized on derivatives in Other Comprehensive (Loss) (25,000) (119,000) (78,000) (206,000)  
Amount of (loss) reclassified from Accumulated Other Comprehensive (Loss) into Interest Expense (14,000) (14,000) (42,000) (29,000)  
Derivative financial instruments related to unconsolidated joint venture          
Number of unconsolidated joint ventures of the entity with interest rate derivatives outstanding     2    
Percentage of ownership in unconsolidated joint venture 50.00%   50.00%    
Notional Amount $ 3,897,000   $ 3,897,000    
Fixed Interest Rate (as a percent) 5.81%   5.81%