Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Accumulated Other Comprehensive Loss and Other Comprehensive Income - Components of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income $ 1,626 $ 179 $ 4,379 $ 1,746
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income 1,496 49 3,987 1,354
Amortization of Prior Service Cost        
Reclassifications to General and Administrative Expense:        
Reclassifications to General and Administrative Expense 101 110 303 329
Amortization of Net Actuarial Losses        
Reclassifications to General and Administrative Expense:        
Reclassifications to General and Administrative Expense 100 90 300 273
Retirement Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income 130 130 392 392
Reclassifications to General and Administrative Expense:        
Tax Benefit $ (71) $ (70) $ (211) $ (210)