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RESTRUCTURING AND ASSET IMPAIRMENT - Severance and Retention Costs by Reportable Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Total severance and transition costs $ 4,675 $ 912 $ 7,169 $ 2,461
DSA        
Segment Reporting Information [Line Items]        
Total severance and transition costs 56 360 1,021 841
Manufacturing        
Segment Reporting Information [Line Items]        
Total severance and transition costs 0 552 870 1,620
Unallocated corporate        
Segment Reporting Information [Line Items]        
Total severance and transition costs $ 4,619 $ 0 $ 5,278 $ 0