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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | $ 128,218 | $ 127,467
Accumulated Amortization | (106,983) | (95,568)
Net Book Value | 21,235 | 31,899
Client-related intangibles |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | 63,115 | 63,164
Accumulated Amortization | (51,224) | (44,835)
Net Book Value | 11,891 | 18,329
Technology |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | 59,742 | 58,942
Accumulated Amortization | (50,398) | (45,372)
Net Book Value | 9,344 | 13,570
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 intangibles |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Useful Lives | 4 years | 4 years
Minimum | Technology |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Useful Lives | 3 years | 3 years
Minimum | Other |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Useful Lives | 1 year |
Maximum | Client-related intangibles |  |
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 |

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