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RESTRUCTURING AND ASSET IMPAIRMENT - Severance and Retention Costs by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total severance and transition costs | $ 1,856 | $ 472 | $ 2,494 | $ 1,549
DSA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total severance and transition costs | 1,197 | 225 | 965 | 481
Manufacturing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total severance and transition costs | 0 | 247 | 870 | 1,068
Unallocated corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total severance and transition costs | $ 659 | $ 0 | $ 659 | $ 0

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