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Property, Plant and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 308,506 $ 288,434  
Property, plant and equipment, net 158,048 159,675  
Depreciation 21,400 20,200 $ 19,000
Machinery and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 191,831 183,175  
Property, plant and equipment, net 88,739 94,154  
Inventory, parts and components, net of reserves 5,600 5,600  
Machinery and Equipment [Member] | Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 23,700 12,100  
Machinery and Equipment [Member] | Finance Leases [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 24,500 18,900  
Property, plant and equipment, net $ 18,700 $ 15,700