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Investments in Unconsolidated Entities​ (Details)
1 Months Ended
Mar. 31, 2021
USD ($)
retail_center
entity
Mar. 31, 2023
USD ($)
Item
power_plant
Dec. 31, 2022
USD ($)
power_plant
Equity method investments:      
Equity method, Carrying value   $ 70,078,000 $ 68,901,000
Other equity investments:      
Other equity investments, carrying value   22,991,000 22,991,000
Investment in unconsolidated entities   $ 93,069,000 $ 91,892,000
Number of publicly traded investments | Item   0  
Carrying value over (under) equity in net assets   $ 0  
Equity interest in two natural gas power plants      
Equity method investments:      
Number of natural gas power plant | power_plant   2 2
Equity method, Carrying value   $ 48,359,000 $ 46,618,000
Investor entity which owns equity in an online real estate company      
Equity method investments:      
Equity method, Participation / Ownership %   50.00%  
Equity method, Carrying value   $ 5,486,000 5,457,000
Equity interest in a residential mortgage originator      
Equity method investments:      
Equity method, Carrying value   0 1,449,000
Various      
Equity method investments:      
Equity method, Carrying value   $ 16,233,000 15,377,000
Other equity investments:      
Investment in unconsolidated entities $ 7,300,000    
Number of investor entities | entity 2    
Number of shopping malls | retail_center 2    
Equity interest in a servicing and advisory business      
Other equity investments:      
Cost method, Participation / Ownership %   2.00%  
Other equity investments, carrying value   $ 12,955,000 12,955,000
Investment funds which own equity in a loan servicer and other real estate assets      
Other equity investments:      
Other equity investments, carrying value   $ 940,000 940,000
Investor entities which own equity interests in two entertainment and retail centers      
Other equity investments:      
Cost method, Participation / Ownership %   15.00%  
Other equity investments, carrying value   $ 7,322,000 7,322,000
Various      
Other equity investments:      
Other equity investments, carrying value   $ 1,774,000 $ 1,774,000
Minimum | Equity interest in two natural gas power plants      
Equity method investments:      
Equity method, Participation / Ownership %   10.00%  
Minimum | Various      
Equity method investments:      
Equity method, Participation / Ownership %   25.00%  
Minimum | Investment funds which own equity in a loan servicer and other real estate assets      
Other equity investments:      
Cost method, Participation / Ownership %   4.00%  
Minimum | Various      
Other equity investments:      
Cost method, Participation / Ownership %   1.00%  
Maximum | Equity interest in two natural gas power plants      
Equity method investments:      
Equity method, Participation / Ownership %   12.00%  
Maximum | Various      
Equity method investments:      
Equity method, Participation / Ownership %   50.00%  
Maximum | Investment funds which own equity in a loan servicer and other real estate assets      
Other equity investments:      
Cost method, Participation / Ownership %   6.00%  
Maximum | Various      
Other equity investments:      
Cost method, Participation / Ownership %   3.00%