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Leases - Supplemental Cash Flow (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 28, 2019
Sep. 29, 2018
Leases [Abstract]      
Operating cash flows from operating leases $ 2,990 $ 8,957  
Operating cash flows from finance leases 3,467 10,764  
Financing cash flows from finance leases 2,213 6,445 $ 5,890
Operating leases 0 0  
Finance leases $ 14,403 $ 18,652