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INTANGIBLE AND OTHER ASSETS (Amortization Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
INTANGIBLE AND OTHER ASSETS        
Amortization expense for intangible assets $ 2,900 $ 3,000 $ 8,900 $ 10,400
Estimated aggregate future amortization expense by fiscal year        
2018 (remaining) 2,930   2,930  
2019 11,480   11,480  
2020 10,950   10,950  
2021 7,118   7,118  
2022 6,254   6,254  
2023 $ 66   $ 66