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Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Significant Accounting Policies [Line Items]                            
Total Assets $ 4,422,246   $ 4,173,971 $ 3,567,547             $ 4,422,246 $ 3,567,547 $ 4,173,971  
Total Liabilities 2,336,586   2,232,163               2,336,586   2,232,163  
Technology and Information Services 36,954     31,707             106,908 89,320    
Professional Fees 25,672     21,848             71,195 68,495    
Revision of Prior Period, Reclassification, Adjustment                            
Significant Accounting Policies [Line Items]                            
Technology and Information Services   $ 10,223 10,196 10,465 $ 9,851 $ 9,009 $ 9,066 $ 9,241 $ 8,186 $ 8,567   29,325 39,521 $ 35,060
Professional Fees   $ (10,223) (10,196) $ (10,465) $ (9,851) $ (9,009) $ (9,066) $ (9,241) $ (8,186) $ (8,567)   $ (29,325) (39,521) $ (35,060)
Variable Interest Entity, Primary Beneficiary [Member]                            
Significant Accounting Policies [Line Items]                            
Total Assets 962,003   581,814               962,003   581,814  
Total Liabilities $ 236,451   $ 246,321               $ 236,451   $ 246,321