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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Goodwill and Other Intangible Assets [Line Items] |  |  |
Cost | $ 133,299 |  | $ 133,344
Accumulated Amortization | (114,610) |  | (113,627)
Net Book Value | 18,689 |  | 19,717
Client-related |  |  |
Goodwill and Other Intangible Assets [Line Items] |  |  |
Cost | 63,096 |  | 63,140
Accumulated Amortization | (54,703) |  | (54,368)
Net Book Value | $ 8,393 |  | 8,772
Client-related | Minimum |  |  |
Goodwill and Other Intangible Assets [Line Items] |  |  |
Useful Lives | 4 years | 4 years |
Client-related | Maximum |  |  |
Goodwill and Other Intangible Assets [Line Items] |  |  |
Useful Lives | 10 years | 10 years |
Technology |  |  |
Goodwill and Other Intangible Assets [Line Items] |  |  |
Cost | $ 64,842 |  | 64,843
Accumulated Amortization | (54,546) |  | (53,898)
Net Book Value | $ 10,296 |  | 10,945
Technology | Minimum |  |  |
Goodwill and Other Intangible Assets [Line Items] |  |  |
Useful Lives | 2 years | 2 years |
Technology | Maximum |  |  |
Goodwill and Other Intangible Assets [Line Items] |  |  |
Useful Lives | 10 years | 10 years |
Other |  |  |
Goodwill and Other Intangible Assets [Line Items] |  |  |
Cost | $ 5,361 |  | 5,361
Accumulated Amortization | (5,361) |  | (5,361)
Net Book Value | $ 0 |  | $ 0
Other | Minimum |  |  |
Goodwill and Other Intangible Assets [Line Items] |  |  |
Useful Lives | 1 year | 1 year |
Other | Maximum |  |  |
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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