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Investments in Unconsolidated Joint Ventures - Acquisition, Development and Construction Arrangements/Sale of Joint Venture Interest or Property (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Oct. 31, 2016
Schedule of Equity Method Investments [Line Items]            
Equity method investments $ 2,946,673   $ 2,946,673   $ 2,912,842  
Equity in net (loss) gain on sale of interest in unconsolidated joint venture/real estate $ 0 $ 0 $ 0 $ 76,181    
Stonehenge Portfolio            
Schedule of Equity Method Investments [Line Items]            
Ownership Interest           90.00%