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Fair Value (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
venture
derivative
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2019
Derivative instruments and Hedging Activities        
Derivative, excluded component, gain, recognized in earnings     $ (753,000)  
Derivative, Notional Amounts Settled During Period $ 250,000,000      
Receipts (payments) for termination of forward interest rate swaps $ (12,309,000) $ 12,598,000 391,000  
Amortization period of deferred gain (loss) on discontinuation of interest rate fair value hedge 10 years      
(Loss) gain on cash flow hedges $ (11,930,000) 5,132,000 $ (13,979,000)  
Cash Flow Hedges Interest Rate Caps        
Derivative instruments and Hedging Activities        
Number of derivative instruments held | derivative 6      
Puts        
Derivative instruments and Hedging Activities        
Number of ventures in which entity is required to purchase interest in investment at guaranteed minimum amount | venture 2      
Interest Rate Swap | Cash Flow Hedges Interest Rate Caps        
Derivative instruments and Hedging Activities        
Derivative, Notional Amount $ 350,000,000      
Weighted average capped interest rate (as a percent) 2.10%      
Derivative, notional amounts entered into during period $ 350,000,000      
Non-designated Hedges Interest Rate Caps        
Derivative instruments and Hedging Activities        
Number of derivative instruments held | derivative 5      
Non-designated Hedges Interest Rate Caps | Interest Rate Caps        
Derivative instruments and Hedging Activities        
Derivative, Notional Amount $ 443,827,000      
Weighted average interest rate (as a percent) 3.20%      
Weighted average capped interest rate (as a percent) 6.50%      
Reclassification out of Accumulated Other Comprehensive Income        
Derivative instruments and Hedging Activities        
Gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred $ 6,983,000      
Unsecured Notes 3.30 Percent [Domain] | Unsecured notes        
Derivative instruments and Hedging Activities        
Stated interest rate (as a percent)       3.30%
Avalon Brooklyn Bay        
Derivative instruments and Hedging Activities        
Due from Related Parties $ 10,650,000 $ 12,819,000