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ACQUISITIONS (SIMOS Narrative) (Details) - SIMOS Insourcing Solutions Corporation - USD ($) $ in Thousands |  | 12 Months Ended
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Dec. 01, 2015 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Cash purchase price, net of working capital adjustment | $ 66,603 |
Significant unobservable inputs (level 3) | Contingent Consideration |  |
Business Acquisition [Line Items] |  |
Payments for previous acquisition |  | $ (22,500)

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