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Fair Value (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
venture
derivative
Mar. 31, 2018
USD ($)
Derivative instruments and Hedging Activities    
(Loss) gain on cash flow hedges $ (7,231) $ 11,501
Cash Flow Hedges    
Derivative instruments and Hedging Activities    
Number of derivative instruments held | derivative 4  
Interest Rate Cap | Cash Flow Hedges    
Derivative instruments and Hedging Activities    
Notional amount $ 33,929  
Interest Rate Swap | Cash Flow Hedges    
Derivative instruments and Hedging Activities    
Notional amount $ 250,000  
Put Option    
Derivative instruments and Hedging Activities    
Number of ventures in which entity is required to purchase interest in investment at guaranteed minimum amount | venture 2  
Reclassification out of Accumulated Other Comprehensive Income    
Derivative instruments and Hedging Activities    
Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months $ 5,752  
Not Designated as Hedging Instrument    
Derivative instruments and Hedging Activities    
Number of derivative instruments held | derivative 10  
Not Designated as Hedging Instrument | Interest Rate Cap    
Derivative instruments and Hedging Activities    
Notional amount $ 587,272