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RESTRUCTURING CHARGES AND IMPAIRMENT (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) employee
Restructuring Charges and Impairment |  |  |
Restructuring charges | $ 1,655 | $ 2,963 | $ 10,313
Software impairment |  |  |
Restructuring Charges and Impairment |  |  |
Restructuring charges |  |  | 6,244
Contract terminations |  |  |
Restructuring Charges and Impairment |  |  |
Restructuring charges | 427 |  | 2,875
Severance and other |  |  |
Restructuring Charges and Impairment |  |  |
Restructuring charges | $ 1,228 | $ 2,963 | $ 1,194
Number of positions in headcount reduction | employee |  |  | 130

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