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RESTRUCTURING RELATED EXPENSES (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 position | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses |  | $ 1,523 | $ 1,483 | $ 200
Number of positions eliminated | position | 60 |  |  |
Selling, General and Administrative Expenses |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses |  | 1,500 | 1,500 |
Selling, General and Administrative Expenses | PHILIPPINES |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses |  |  |  | $ 200
Selling, General and Administrative Expenses | Severance and termination benefits |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring expenses |  | $ 300 | $ 800 |

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