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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | $ 136,493 | $ 135,668
Accumulated Amortization | (125,605) | (121,605)
Net book value | 10,888 | 14,063
Client-related |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | 63,076 | 63,165
Accumulated Amortization | (58,623) | (57,342)
Net book value | 4,453 | 5,823
Technology |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | 68,056 | 67,142
Accumulated Amortization | (61,621) | (58,902)
Net book value | 6,435 | 8,240
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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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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