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Equity Investments (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2022
USD ($)
lease
Dec. 31, 2021
USD ($)
Jun. 30, 2021
agreement
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Feb. 28, 2022
USD ($)
Nov. 30, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]                      
Carrying value [1]       $ 287,118   $ 287,118   $ 180,388      
Earnings from equity method investments       7,451 $ 2,244 16,520 $ 6,772        
iStar Inc.                      
Schedule of Equity Method Investments [Line Items]                      
Value of land acquired                     $ 33,300
Number of agreements entered into to acquire land and related Ground Lease | agreement     2                
iStar Inc. | Ground Lease Plus Fund                      
Schedule of Equity Method Investments [Line Items]                      
Gain (loss) from sale of Ground Lease $ 500 $ 0                  
Number of Ground Leases sold | lease 2                    
425 Park Avenue | Equity Method Venture                      
Schedule of Equity Method Investments [Line Items]                      
Carrying value       134,762   134,762   133,118      
Earnings from equity method investments       $ 938 863 $ 2,645 2,540        
Ownership percentage       54.80%   54.80%          
32 Old Slip                      
Schedule of Equity Method Investments [Line Items]                      
Carrying value       $ 51,145   $ 51,145   $ 47,270      
Earnings from equity method investments       1,406 $ 1,381 4,253 $ 4,232        
Ownership percentage     29.20%                
Ground Lease Plus Fund                      
Schedule of Equity Method Investments [Line Items]                      
Carrying value       61,308   61,308          
Earnings from equity method investments       1,825   3,513          
Basis difference in equity investment to be amortized       20,200   20,200          
Amortization of basis difference in equity investments       $ 800   $ 1,600          
Weighted average remaining term           100 years 7 months 6 days          
Ownership percentage       53.00%   53.00%          
Leasehold Loan Fund                      
Schedule of Equity Method Investments [Line Items]                      
Carrying value       $ 39,903   $ 39,903          
Earnings from equity method investments       3,282   6,109          
Basis difference in equity investment to be amortized       12,300   12,300          
Amortization of basis difference in equity investments       $ 1,000   $ 2,000          
Weighted average remaining term           3 years 3 months 18 days          
Ownership percentage       53.00%   53.00%          
Leasehold Loan Fund | Life science property                      
Schedule of Equity Method Investments [Line Items]                      
Commitment to provide loan to Ground lessee                   $ 130,000  
Leasehold Loan Fund | Mixed-use property                      
Schedule of Equity Method Investments [Line Items]                      
Commitment to provide loan to Ground lessee                 $ 105,000    
Loan commitment to Ground lessee that has been funded                 $ 39,500    
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).