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Leases - Supplemental Cash Flow (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 29, 2019
Jun. 30, 2018
Leases [Abstract]      
Operating cash flows from operating leases $ 3,064 $ 5,967  
Operating cash flows from finance leases 3,155 6,403  
Financing cash flows from finance leases 2,045 4,232 $ 3,262
Operating leases 0 0  
Finance leases $ 3,462 $ 4,250