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Fair Value Measurements (Details 4) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 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  
Cash flow hedges
    
Reclassification of gain (loss)    
Gain or loss recognized with respect to cash flow hedges' ineffectiveness $ 0 $ 0
Interest rate derivatives | Cash flow hedges
    
Fair Value Measurements    
Amount of (loss) gain recognized on derivatives in Other comprehensive (loss) (1,106,000) 26,000
Amount of (loss) reclassification from Accumulated other comprehensive (loss) into Equity in earning (388,000) (152,000)
Reclassification of gain (loss)    
Additional amount to be reclassified to interest expense during the next twelve months 1,639,000  
Credit risk related contingent feature    
Fair value of derivative in a liability position, including accrued interest and excluding adjustments for nonperformance risk 1,571,000  
Termination value of derivative agreement 1,571,000  
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%  
Notional Amount 3,776,000  
Fixed Interest Rate (as a percent) 5.81%  
Amount of (loss) gain recognized on derivatives in Other comprehensive (loss) (7,000) (4,000)
Amount of (loss) reclassification from Accumulated other comprehensive (loss) into Equity in earning $ (14,000) $ (14,000)