Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details)

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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 31, 2019
Property, Plant and Equipment    
Property, plant and equipment, gross $ 210,743 $ 205,180
Less Accumulated Depreciation 102,632 92,681
Property, plant and equipment, net 108,111 112,499
Held for Sale | Test Systems Segment    
Property, Plant and Equipment    
Net property, plant and equipment, held for sale   1,500
Land    
Property, Plant and Equipment    
Property, plant and equipment, gross 9,837 9,802
Buildings and Improvements    
Property, Plant and Equipment    
Property, plant and equipment, gross 75,188 74,723
Machinery and Equipment    
Property, Plant and Equipment    
Property, plant and equipment, gross 119,688 115,202
Construction in Progress    
Property, Plant and Equipment    
Property, plant and equipment, gross $ 6,030 $ 5,453