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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Assets:    
Funds held in trust account $ 0 $ 174,437
Securities and other investments owned:    
Investments 992,455 965,096
Loans receivable, at fair value 532,419 701,652
Total assets measured at fair value 1,524,874 1,841,185
Securities sold not yet purchased:    
Total securities sold not yet purchased 8,601 5,897
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 5,835 4,648
Warrant liabilities   173
Contingent consideration 27,985 31,046
Total liabilities measured at fair value 42,421 41,764
Quoted prices in active markets for identical assets (Level 1)    
Assets:    
Funds held in trust account   174,437
Securities and other investments owned:    
Investments 250,586 584,136
Loans receivable, at fair value 0 0
Total assets measured at fair value 250,586 758,573
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,037 4,466
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 0 0
Warrant liabilities   173
Contingent consideration 0 0
Total liabilities measured at fair value 1,037 4,639
Other observable inputs (Level 2)    
Assets:    
Funds held in trust account   0
Securities and other investments owned:    
Investments 6,231 12,495
Loans receivable, at fair value 0 0
Total assets measured at fair value 6,231 12,495
Securities sold not yet purchased:    
Total securities sold not yet purchased 7,564 1,431
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 0 0
Warrant liabilities   0
Contingent consideration 0 0
Total liabilities measured at fair value 7,564 1,431
Significant unobservable inputs (Level 3)    
Assets:    
Funds held in trust account   0
Securities and other investments owned:    
Investments 735,638 368,465
Loans receivable, at fair value 532,419 701,652
Total assets measured at fair value 1,268,057 1,070,117
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 5,835 4,648
Warrant liabilities   0
Contingent consideration 27,985 31,046
Total liabilities measured at fair value 33,820 35,694
Equity securities    
Securities and other investments owned:    
Investments 930,179 952,601
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,037 4,466
Equity securities | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Investments 194,541 584,136
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,037 4,466
Equity securities | Other observable inputs (Level 2)    
Securities and other investments owned:    
Investments 0 0
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Equity securities | Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Investments 735,638 368,465
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Corporate bonds    
Securities and other investments owned:    
Investments 59,287 8,539
Securities sold not yet purchased:    
Total securities sold not yet purchased 5,971 1,162
Corporate bonds | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Investments 56,045 0
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Corporate bonds | Other observable inputs (Level 2)    
Securities and other investments owned:    
Investments 3,242 8,539
Securities sold not yet purchased:    
Total securities sold not yet purchased 5,971 1,162
Corporate bonds | Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Investments 0 0
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Other fixed income securities    
Securities and other investments owned:    
Investments 2,989 3,956
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,593 269
Other fixed income securities | Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Investments 0 0
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Other fixed income securities | Other observable inputs (Level 2)    
Securities and other investments owned:    
Investments 2,989 3,956
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,593 269
Other fixed income securities | Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Investments 0 0
Securities sold not yet purchased:    
Total securities sold not yet purchased $ 0 $ 0