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Other Investments (Other Real Estate Equity Investments) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2022
USD ($)
Feb. 28, 2022
USD ($)
Jan. 31, 2022
USD ($)
lease
Dec. 31, 2021
USD ($)
Nov. 30, 2021
USD ($)
Jan. 31, 2021
USD ($)
loan
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]                    
Equity method investments       $ 1,297,281,000     $ 1,605,268,000   $ 1,605,268,000  
Net proceeds from sales of loans receivable                 145,583,000 $ 122,609,000
Income from sales of real estate             $ 951,000 $ 25,611,000 $ 1,443,000 26,319,000
Payments to acquire property         $ 33,300,000          
Ground Lease Plus Fund                    
Schedule of Equity Method Investments [Line Items]                    
Number of ground leases sold | lease     2              
Income from sales of real estate     $ 500,000 0            
Other real estate equity investments | Minimum                    
Schedule of Equity Method Investments [Line Items]                    
Equity interest             48.00%   48.00%  
Other real estate equity investments | Maximum                    
Schedule of Equity Method Investments [Line Items]                    
Equity interest             95.00%   95.00%  
Other real estate equity investments | Operating Properties                    
Schedule of Equity Method Investments [Line Items]                    
Equity method investments       43,300,000     $ 33,800,000   $ 33,800,000  
Other real estate equity investments | Land                    
Schedule of Equity Method Investments [Line Items]                    
Equity method investments       $ 1,100,000            
Other Real Estate Equity Investment Aug 2018                    
Schedule of Equity Method Investments [Line Items]                    
Equity Interest sold       50.00%            
Interest income               600,000   1,700,000
Other Real Estate Equity Investment January 2021                    
Schedule of Equity Method Investments [Line Items]                    
Equity interest           53.00%        
Equity method investments           $ 63,300,000        
Number of loans sold | loan           2        
Net proceeds from sales of loans receivable           $ 83,400,000        
Recognized gain or loss           $ 0        
Other Real Estate Equity Investment September 2021                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to provide loan to lessee               $ 75,000,000.0   $ 75,000,000.0
Loan Fund [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Equity interest             53.00%   53.00%  
Loan Fund [Member] | SAFE                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to provide loan to lessee $ 105,000,000.0 $ 130,000,000.0                
Consideration received for loan commitment $ 5,000,000.0 $ 9,000,000.0