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Equipment, Leasehold Improvements and Software - Components of Depreciation and Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Dec. 28, 2018
Property, Plant and Equipment [Line Items]          
Depreciation expense, various assets     $ 9,539 $ 7,234  
Equipment and vehicles financed by leases $ 90,531   90,531   $ 85,276
Excluding assets held under finance leases          
Property, Plant and Equipment [Line Items]          
Depreciation expense, various assets 2,473   6,595    
Excluding assets held under capital leases          
Property, Plant and Equipment [Line Items]          
Depreciation expense, various assets   $ 1,710   5,245  
Software          
Property, Plant and Equipment [Line Items]          
Depreciation expense, various assets 926 $ 1,008 2,746 $ 1,941  
Assets held under finance leases          
Property, Plant and Equipment [Line Items]          
Equipment and vehicles financed by leases $ 1,633   $ 1,633    
Assets held under capital leases          
Property, Plant and Equipment [Line Items]          
Assets financed by capital lease         $ 52