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
Jun. 29, 2019
Mar. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total Shareholders’ Equity $ 474,966   $ 386,625 $ 351,290    
Foreign Currency Translation Adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total Shareholders’ Equity (6,542)   (7,156)      
Retirement Liability Adjustment            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Retirement Liability Adjustment – Before Tax (7,442)   (7,814)      
Tax Benefit of Retirement Liability Adjustment 1,563   1,641      
Total Shareholders’ Equity (5,879)   (6,173)      
Accumulated Comprehensive Loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total Shareholders’ Equity $ (12,421) $ (13,449) $ (13,329) $ (15,867) $ (14,277) $ (13,352)