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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 |

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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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