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Other Investments (Schedule of Other Investments) (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]      
Other investments [1] $ 1,237,295   $ 1,176,560
Earnings (losses) from equity method investments 12,769 $ 16,612  
Interest expense 39,563 43,392  
Mark-to-market gain $ 5,100 9,900  
SAFE      
Schedule of Equity Method Investments [Line Items]      
Number of shares owned (in shares) 34.8    
Closing price (in dollars per share) $ 70.10    
Market value $ 2,400,000    
Dilution gain 500 7,900  
Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Schedule of Equity Method Investments [Line Items]      
Other investments 1,237,295   1,176,560
Earnings (losses) from equity method investments 12,769 16,612  
Depreciation expense 5,600 4,000  
Interest expense 15,500 13,700  
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Other strategic investments      
Schedule of Equity Method Investments [Line Items]      
Other investments 127,972   69,911
Earnings (losses) from equity method investments 958 (837)  
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Schedule of Equity Method Investments [Line Items]      
Carrying value 1,109,323   1,106,649
Earnings (losses) from equity method investments 11,811 17,449  
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | SAFE      
Schedule of Equity Method Investments [Line Items]      
Carrying value 955,758   937,712
Earnings (losses) from equity method investments 11,412 19,338  
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | iStar Net Lease II LLC (Net Lease Venture II)      
Schedule of Equity Method Investments [Line Items]      
Carrying value 84,481   78,998
Earnings (losses) from equity method investments 1,001 193  
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | Other real estate equity investments      
Schedule of Equity Method Investments [Line Items]      
Carrying value 69,084   $ 89,939
Earnings (losses) from equity method investments $ (602) $ (2,082)  
[1] (1)Refer to Note 2 for details on the Company's consolidated variable interest entities ("VIEs").