v3.26.1
FAIR VALUE MEASUREMENTS - Schedule of fair value measurement of level 3 financial assets and liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Contingent Consideration    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Change in unrealized gains (losses) $ 4,394 $ (850)
Embedded Derivatives    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Change in unrealized gains (losses) 8,119  
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Adjustments   (349,918)
Partnership interests and other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Adjustments   0
Loans Receivable at Fair Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Adjustments   (325,499)
Trading Losses Income and Fair Value Adjustments on Loan | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Adjustments   (70,437)
Gain (Loss) on Investments | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Adjustments   (279,481)
Level 3 | Contingent Consideration    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period 4,538 25,194
Fair Value Adjustments (4,394) 850
Relating to Undistributed Earnings 0 0
Purchases/Originations 0 0
Sales 0 0
Settlements / Repayments (144) (10,693)
Transfers in and /or out of Level 3 0 (10,813)
Balance at end of period 0 4,538
Change in unrealized gains (losses) 0 0
Level 3 | Liability-Classified Warrants    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period 0 0
Fair Value Adjustments (1,460) 0
Relating to Undistributed Earnings 0 0
Purchases/Originations 7,860 0
Sales 0 0
Settlements / Repayments 0 0
Transfers in and /or out of Level 3 0 0
Balance at end of period 6,400 0
Change in unrealized gains (losses) 1,460 0
Level 3 | Embedded Derivatives    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance at beginning of period 0 0
Fair Value Adjustments (8,119) 0
Relating to Undistributed Earnings 0 0
Purchases/Originations 11,244 0
Sales 0 0
Settlements / Repayments (3,125) 0
Transfers in and /or out of Level 3 0 0
Balance at end of period 0 0
Change in unrealized gains (losses) 0 0
Level 3 | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 40,516 452,581
Fair Value Adjustments (362)  
Relating to Undistributed Earnings 0 20
Purchases/Originations 372,104 3,862
Sales (10,586) (78,197)
Settlements / Repayments (330,449) 13,245
Transfers in and /or out of Level 3 0 (1,077)
Balance at end of period 71,223 40,516
Change in unrealized gains (losses) (339) (65,839)
Level 3 | Partnership interests and other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 0 0
Fair Value Adjustments 0  
Relating to Undistributed Earnings 0 0
Purchases/Originations 0 0
Sales 0 0
Settlements / Repayments 0 0
Transfers in and /or out of Level 3 40,082 0
Balance at end of period 40,082 0
Change in unrealized gains (losses) 0 0
Level 3 | Loans Receivable at Fair Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 90,103 532,419
Fair Value Adjustments (448)  
Relating to Undistributed Earnings 16 5,420
Purchases/Originations 117,714 107,025
Sales (10,415) (30,936)
Settlements / Repayments (170,667) (198,326)
Transfers in and /or out of Level 3 0 0
Balance at end of period 26,303 90,103
Change in unrealized gains (losses) (1,985) $ (335,295)
Level 3 | Trading Losses Income and Fair Value Adjustments on Loan | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Adjustments (1,493)  
Level 3 | Gain (Loss) on Investments | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Adjustments $ 1,131