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INTANGIBLE AND OTHER ASSETS (Amortization Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
INTANGIBLE AND OTHER ASSETS        
Amortization expense for intangible assets $ 3,000 $ 3,700 $ 6,000 $ 7,400
Estimated aggregate future amortization expense by fiscal year        
2018 (remaining) 5,924   5,924  
2019 11,491   11,491  
2020 10,963   10,963  
2021 7,084   7,084  
2022 6,254   6,254  
2023 $ 61   $ 61