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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | $ 133,319 | $ 128,218
Accumulated Amortization | (111,574) | (106,983)
Net Book Value | 21,745 | 21,235
Client-related intangibles |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | 63,115 | 63,115
Accumulated Amortization | (53,608) | (51,224)
Net Book Value | $ 9,507 | $ 11,891
Client-related intangibles | Minimum |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Useful Lives | 4 years | 4 years
Client-related intangibles | Maximum |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Useful Lives | 10 years | 10 years
Technology |  |
Goodwill and Other Intangible Assets [Line Items] |  |
Cost | $ 64,843 | $ 59,742
Accumulated Amortization | (52,605) | (50,398)
Net Book Value | $ 12,238 | $ 9,344
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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