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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Amortizable Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Other Intangible Assets [Line Items]    
Cost $ 133,372 $ 133,344
Accumulated Amortization (117,624) (113,627)
Net book value 15,748 19,717
Client-related    
Goodwill and Other Intangible Assets [Line Items]    
Cost 63,168 63,140
Accumulated Amortization (55,877) (54,368)
Net book value 7,291 8,772
Technology    
Goodwill and Other Intangible Assets [Line Items]    
Cost 64,843 64,843
Accumulated Amortization (56,386) (53,898)
Net book value 8,457 10,945
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