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Other Investments (Other Real Estate Equity Investments) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2021
USD ($)
loan
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]            
Net proceeds from sales of loans receivable       $ 122,609,000 $ 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   $ 43,700,000   $ 43,700,000   $ 58,700,000
Other real estate equity investments | Land and Land Development            
Schedule of Equity Method Investments [Line Items]            
Equity method investments   $ 500,000   $ 500,000   $ 31,200,000
Other Real Estate Equity Investment Aug 2018            
Schedule of Equity Method Investments [Line Items]            
Equity interest   50.00%   50.00%    
Loans receivable, carrying value   $ 33,000,000.0   $ 33,000,000.0    
Interest income   $ 600,000 $ 600,000 $ 1,700,000 $ 1,800,000  
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]            
Equity interest   53.00%   53.00%    
Commitment to provide loan to lessee   $ 75,000,000.0   $ 75,000,000.0