Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Components of Other Comprehensive Income (Loss) (Details)

v3.19.1
Shareholders' Equity - Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income $ (120) $ 448
Total Other Comprehensive (Loss) Income (120) 448
Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income (270) 233
Total Other Comprehensive (Loss) Income (270) 233
Amortization of Prior Service Cost    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification to General and Administrative Expense 101 101
Amortization of Net Actuarial Losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification to General and Administrative Expense 85 172
Retirement Liability Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other Comprehensive Income 150 215
Tax Benefit (36) (58)
Total Other Comprehensive (Loss) Income $ 150 $ 215