Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Shareholders' Equity - Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income $ 1,624 $ (1,189) $ 560 $ (281)
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income 1,409 (1,336) (85) (722)
Amortization of Prior Service Cost        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification to General and Administrative Expense 101 101 302 302
Amortization of Net Actuarial Losses        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification to General and Administrative Expense 171 85 515 256
Retirement Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Tax Benefit (57) (39) (172) (117)
Other comprehensive income $ 215 $ 147 $ 645 $ 441