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Leases - Supplemental Cash Flow Information Related to Finance Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 27, 2019
Sep. 28, 2018
Leases [Abstract]      
Amortization of finance lease right-of-use asset $ 141 $ 447  
Interest on finance lease liabilities 17 58  
Cash paid for amounts included in the measurement of finance lease liabilities:      
Operating cash flows 17 58  
Financing cash flows 317 998 $ 1,396
Right-of-use assets obtained in exchange for new finance lease liabilities $ 0 $ 679