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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - CECL Allowance as Percentage of Amortized Cost and Total Commitment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Allowance and Provision for Loan Credit Loss [Abstract]        
Beginning balance, specific CECL allowance, funded $ 30,836      
Write-offs, specific CECL allowance, funded 0   $ (127,512)  
Ending balance, specific CECL allowance, funded 34,712   30,836  
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]        
Beginning balance, General CECL allowance, funded 30,836 $ 26,482 26,482  
Allowances (Reversals), net 3,876 6,076    
Quarter writeoff, General CECL allowance, funded 0      
Ending balance, General CECL allowance, funded 34,712 32,558 30,836  
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]        
Beginning balance, General CECL allowance, unfunded 5,948 4,017 4,017  
Allowances (Reversals), net 132 (392)    
Quarter writeoff, General CECL allowance, unfunded 0      
Ending balance, General CECL allowance, unfunded 6,080 3,625 5,948  
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]        
General CECL Allowance 36,784 30,499 30,499  
Allowances (Reversals), net 4,008 5,684    
General CECL Allowance writeoff 0      
General CECL Allowance 40,792 36,183 36,784  
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]        
Total CECL Allowance 379,284 223,499 223,499  
Allowances (Reversals), net 4,008 147,684    
Total CECL Allowance, writeoff 0      
Total CECL Allowance $ 383,292 $ 371,183 $ 379,284  
General CECL allowance, % of amortized cost 0.54% 0.44% 0.52% 0.38%
Total CECL allowance, % of amortized cost 4.75% 4.29% 5.07% 2.61%
Commercial Mortgage and Subordinated Portfolio Segment        
Allowance and Provision for Loan Credit Loss [Abstract]        
Beginning balance, specific CECL allowance, funded $ 342,500 $ 193,000 $ 193,000  
Allowances (Reversals), net 0 142,000    
Write-offs, specific CECL allowance, funded 0      
Ending balance, specific CECL allowance, funded 342,500 $ 335,000 $ 342,500  
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]        
Total CECL Allowance $ 342,500