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Fair Value Measurements (Details 4) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
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  
Cash flow hedges
        
Reclassification of gain (loss)        
Gain or loss recognized with respect to cash flow hedges' ineffectiveness. $ 0 $ 0 $ 0 $ 0
Interest rate derivatives | Cash flow hedges
        
Fair Value Measurements        
Amount of gain (loss) recognized on derivatives in Other comprehensive (loss) 574,000 (533,000) 600,000 (650,000)
Amount of (loss) reclassification from Accumulated other comprehensive (loss) into interest expense/earnings (156,000) (132,000) (308,000) (238,000)
Reclassification of gain (loss)        
Additional amount to be reclassified to interest expense during the next twelve months     604,000  
Credit risk related contingent feature        
Fair value of derivative in a liability position, including accrued interest and excluding adjustments for nonperformance risk 757,000   757,000  
Termination value of derivative agreement 757,000   757,000  
Interest rate derivatives | Cash flow hedges | Unconsolidated joint ventures
        
Fair Value Measurements        
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 3,838,000   3,838,000  
Fixed Interest Rate (as a percent) 5.81%   5.81%  
Amount of gain (loss) recognized on derivatives in Other comprehensive (loss) 37,000 (49,000) 33,000 (52,000)
Amount of (loss) reclassification from Accumulated other comprehensive (loss) into interest expense/earnings $ (14,000) $ (14,000) $ (28,000) $ (28,000)