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Investments in Unconsolidated Entities​ (Details)
3 Months Ended
Mar. 31, 2024
USD ($)
investment
power_plant
Dec. 31, 2023
USD ($)
power_plant
Equity method investments:    
Equity method, carrying value $ 75,189,000 $ 74,659,000
Other equity investments:    
Other equity investments, carrying value 21,738,000 15,717,000
Investment in unconsolidated entities $ 96,927,000 $ 90,376,000
Number of publicly traded investments | investment 0  
Carrying value over (under) equity in net assets $ 0  
Equity interests in two natural gas power plants    
Equity method investments:    
Number of natural gas power plant | power_plant 2 2
Equity method, carrying value $ 52,557,000 $ 52,230,000
Investor entity which owns equity in an online real estate company    
Equity method investments:    
Equity method, Participation / Ownership % 50.00%  
Equity method, carrying value $ 5,579,000 5,575,000
Various    
Equity method investments:    
Equity method, carrying value $ 17,053,000 16,854,000
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
Equity interest in a data center business in Ireland    
Other equity investments:    
Cost method, Participation / Ownership % 0.72%  
Other equity investments, carrying value $ 7,334,000 1,313,000
Threshold percentage of interest acquired by related parties 50.00%  
Increase in carrying value resulting from an observable price change $ 6,000,000  
Investment funds which own equity in a loan servicer and other real estate assets    
Other equity investments:    
Other equity investments, carrying value 842,000 842,000
Various    
Other equity investments:    
Other equity investments, carrying value $ 607,000 $ 607,000
Minimum | Equity interests in two natural gas power plants    
Equity method investments:    
Equity method, Participation / Ownership % 10.00%  
Minimum | Various    
Equity method investments:    
Equity method, Participation / Ownership % 20.00%  
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 % 3.00%  
Maximum | Equity interests 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 % 15.00%