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Debt and Preferred Equity Investments - Preferred Equity Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Preferred equity investment    
Mortgage loans on real estate, interest rate 8.42%  
Carrying value $ 1,580,306 $ 2,099,393
Preferred Equity, April 2021    
Preferred equity investment    
Future Funding Obligations 0  
Senior Financing 272,000  
Carrying value 141,171 143,183
Preferred Equity Redeemed in May 2017    
Preferred equity investment    
Future Funding Obligations 0  
Senior Financing 1,763,529  
Carrying value $ 98,065 143,274
Preferred equity investments    
Preferred equity investment    
Mortgage loans on real estate, interest rate 9.63%  
Future Funding Obligations $ 0  
Senior Financing 2,035,529  
Carrying value $ 239,236 $ 286,457