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COST OF REVENUE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cost of Revenue [Abstract]    
Compensation and benefits $ 69,990 $ 94,365
Outside fees and services 66,386 146,322
Technology and telecommunications 25,273 35,912
Reimbursable expenses 6,555 16,285
Depreciation and amortization 3,162 12,310
Total $ 171,366 $ 305,194