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INTANGIBLE ASSETS AND GOODWILL - Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Estimated amortization expense        
Amortization expense $ 276 $ 11,895 $ 23,878 $ 35,858
2019 (Remainder) 276   276  
2020 803   803  
2021 680   680  
2022 655   655  
2023 667   667  
2024 $ 640   $ 640