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LEASES - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Lessee Lease Description [Line Items]          
Operating lease right-of-use assets $ 41,650,000   $ 41,650,000   $ 12,096,000
Operating lease liabilities $ 44,775,000   $ 44,775,000   $ 12,876,000
Weighted average discount rate 4.39%   4.39%   2.72%
Weighted average lease term 9 years 5 months 15 days   9 years 5 months 15 days   6 years 9 months
Operating lease costs $ 1,700,000 $ 792,000 $ 4,000,000 $ 2,400,000  
Variable lease costs 104,000 $ 58,000 262,000 $ 200,000  
Main Office [Member]          
Lessee Lease Description [Line Items]          
Operating lease right-of-use assets 18,200,000   18,200,000    
Operating lease liabilities 19,000,000   19,000,000    
New York City [Member]          
Lessee Lease Description [Line Items]          
Operating lease right-of-use assets 13,400,000   13,400,000    
Operating lease liabilities $ 15,000,000   $ 15,000,000    
Minimum [Member]          
Lessee Lease Description [Line Items]          
Remaining lease term     2 months   4 months
Maximum [Member]          
Lessee Lease Description [Line Items]          
Remaining lease term     12 years   13 years