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RESTRUCTURING CHARGES (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 employee
Restructuring Charges |  |  |
Restructuring charges | $ 1,655 | $ 2,963 |
Contract terminations |  |  |
Restructuring Charges |  |  |
Restructuring charges | 427 |  |
Severance and other |  |  |
Restructuring Charges |  |  |
Restructuring charges | $ 1,228 | $ 2,963 |
Number of positions in headcount reduction | employee |  |  | 130

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