Quarterly report pursuant to Section 13 or 15(d)

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

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Accumulated Other Comprehensive Loss and Other Comprehensive Loss - Components of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income $ 2,227 $ (381) $ 2,753 $ 1,566
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income 2,096 (511) 2,491 1,305
Amortization of Prior Service Cost        
Reclassifications to General and Administrative Expense:        
Reclassifications to General and Administrative Expense 102 109 202 219
Amortization of Net Actuarial Losses        
Reclassifications to General and Administrative Expense:        
Reclassifications to General and Administrative Expense 99 92 201 183
Retirement Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income 131 130 262 261
Reclassifications to General and Administrative Expense:        
Tax Benefit $ (70) $ (71) $ (141) $ (141)