Quarterly report pursuant to Section 13 or 15(d)

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

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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
Jul. 03, 2021
Apr. 03, 2021
Dec. 31, 2020
Jun. 27, 2020
Mar. 28, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income $ 254,851   $ 270,371 $ 292,359    
Foreign Currency Translation Adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income (4,490)   (4,468)      
Retirement Liability Adjustment            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Retirement Liability Adjustment – Before Tax (13,396)   (14,264)      
Tax Benefit of Retirement Liability Adjustment 2,282   2,282      
Accumulated other comprehensive income (11,114)   (11,982)      
Accumulated Comprehensive Loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income $ (15,604) $ (16,653) $ (16,450) $ (16,692) $ (17,717) $ (15,628)