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Leases - Maturities of operating lease liabilities (Details)
$ in Thousands
Dec. 28, 2019
USD ($)
Leases  
2020 $ 5,604
2021 4,410
2022 3,713
2023 3,061
2024 2,524
Thereafter 1,272
Total lease payments 20,584
Less imputed interest (2,690)
Total lease liabilities $ 17,894