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Leases - Aggregate minimum lease commitments (Details) - USD ($)
$ in Thousands
Sep. 26, 2019
Dec. 27, 2018
Operating Leases    
2019   $ 11,317
2020   10,169
2021   9,670
2022   9,910
2023   9,038
2024 and thereafter   80,523
Total minimum lease payments   130,627
Finance Leases    
2019 $ 1,020 3,073
2020 3,584 2,978
2021 2,992 2,679
2022 2,946 2,718
2023 2,836 2,718
2024 and thereafter 16,948 16,940
Total minimum lease payments 30,326 31,106
Less: amount representing interest (6,248) (6,978)
Total present value of minimum capital lease payments $ 24,078 $ 24,128