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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Amortizable Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Dec. 31, 2020
Goodwill and Other Intangible Assets [Line Items]      
Cost $ 135,683   $ 133,372
Accumulated Amortization (118,635)   (117,624)
Total 17,048   15,748
Client-related      
Goodwill and Other Intangible Assets [Line Items]      
Cost 63,180   63,168
Accumulated Amortization (56,260)   (55,877)
Total 6,920   7,291
Technology      
Goodwill and Other Intangible Assets [Line Items]      
Cost 67,142   64,843
Accumulated Amortization (57,014)   (56,386)
Total 10,128   8,457
Other      
Goodwill and Other Intangible Assets [Line Items]      
Cost 5,361   5,361
Accumulated Amortization (5,361)   (5,361)
Total $ 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