Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Loss and Other Comprehensive Income - Components of Other Comprehensive Income (Details)

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Accumulated Other Comprehensive Loss and Other Comprehensive Income - Components of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income $ 442 $ 1,626 $ (700) $ 4,379
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income 226 1,496 (1,346) 3,987
Amortization of Prior Service Cost        
Reclassifications to General and Administrative Expense:        
Reclassifications to General and Administrative Expense 101 101 303 303
Amortization of Net Actuarial Losses        
Reclassifications to General and Administrative Expense:        
Reclassifications to General and Administrative Expense 172 100 515 300
Retirement Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income 216 130 646 392
Reclassifications to General and Administrative Expense:        
Tax Benefit $ (57) $ (71) $ (172) $ (211)