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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | $ 133,344 | $ 128,218
Accumulated Amortization | (113,627) | (106,983)
Net Book Value | 19,717 | 21,235
Client-related |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | 63,140 | 63,115
Accumulated Amortization | (54,368) | (51,224)
Net Book Value | 8,772 | 11,891
Technology |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | 64,843 | 59,742
Accumulated Amortization | (53,898) | (50,398)
Net Book Value | 10,945 | 9,344
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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