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
Mar. 28, 2020
Dec. 31, 2019
Mar. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total Shareholders’ Equity $ 313,809 $ 388,857 $ 466,003  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total Shareholders’ Equity (9,346) (7,042)    
Retirement Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Retirement Liability Adjustment – Before Tax (10,596) (10,868)    
Tax Benefit of Retirement Liability Adjustment 2,225 2,282    
Total Shareholders’ Equity (8,371) (8,586)    
Accumulated Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total Shareholders’ Equity $ (17,717) $ (15,628) $ (13,449) $ (13,329)