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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Amortizable Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Goodwill and Other Intangible Assets [Line Items]    
Cost $ 135,668 $ 133,372
Accumulated Amortization (121,605) (117,624)
Net book value 14,063 15,748
Client-related    
Goodwill and Other Intangible Assets [Line Items]    
Cost 63,165 63,168
Accumulated Amortization (57,342) (55,877)
Net book value 5,823 7,291
Technology    
Goodwill and Other Intangible Assets [Line Items]    
Cost 67,142 64,843
Accumulated Amortization (58,902) (56,386)
Net book value 8,240 8,457
Other    
Goodwill and Other Intangible Assets [Line Items]    
Cost 5,361 5,361
Accumulated Amortization (5,361) (5,361)
Net book value $ 0 $ 0
Minimum | Client-related    
Goodwill and Other Intangible Assets [Line Items]    
Useful Lives 4 years 4 years
Minimum | Technology    
Goodwill and Other Intangible Assets [Line Items]    
Useful Lives 2 years 2 years
Minimum | Other    
Goodwill and Other Intangible Assets [Line Items]    
Useful Lives 1 year 1 year
Maximum | Client-related    
Goodwill and Other Intangible Assets [Line Items]    
Useful Lives 10 years 10 years
Maximum | Technology    
Goodwill and Other Intangible Assets [Line Items]    
Useful Lives 10 years 10 years
Maximum | Other    
Goodwill and Other Intangible Assets [Line Items]    
Useful Lives 5 years 5 years