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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

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