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RESTRUCTURING CHARGES AND IMPAIRMENT (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) employee
Restructuring Charges and Impairment |  |  |
Restructuring charges |  | $ 10,300 | $ 10,313
Expected restructuring charges in first quarter of 2017 |  | $ 2,000 | 2,000
Software impairment |  |  |
Restructuring Charges and Impairment |  |  |
Restructuring charges | $ 6,200 |  | 6,244
Contract terminations |  |  |
Restructuring Charges and Impairment |  |  |
Restructuring charges |  |  | 2,875
Severance and other |  |  |
Restructuring Charges and Impairment |  |  |
Restructuring charges |  |  | $ 1,194
Number of positions in headcount reduction | employee |  |  | 130

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