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Accumulated Other Comprehensive Items - Components of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Total Stockholders' Equity [Roll Forward]    
Beginning balance $ 332,504 $ 284,279
Ending balance 345,227 295,290
Foreign Currency Translation Adjustment [Member]    
Total Stockholders' Equity [Roll Forward]    
Beginning balance (17,501)  
Other comprehensive income (loss) before reclassifications 5,293  
Reclassifications from AOCI 0  
Net current period other comprehensive income 5,293  
Ending balance (12,208)  
Unrecognized Prior Service Cost on Pension and Other Post- Retirement Benefit Plans [Member]    
Total Stockholders' Equity [Roll Forward]    
Beginning balance (319)  
Other comprehensive income (loss) before reclassifications (1)  
Reclassifications from AOCI 18  
Net current period other comprehensive income 17  
Ending balance (302)  
Net Actuarial Loss on Pension and Other Post- Retirement Benefit Plans [Member]    
Total Stockholders' Equity [Roll Forward]    
Beginning balance (8,974)  
Other comprehensive income (loss) before reclassifications (39)  
Reclassifications from AOCI 139  
Net current period other comprehensive income 100  
Ending balance (8,874)  
Deferred Gain on Cash Flow Hedges [Member]    
Total Stockholders' Equity [Roll Forward]    
Beginning balance 79  
Other comprehensive income (loss) before reclassifications 89  
Reclassifications from AOCI 4  
Net current period other comprehensive income 93  
Ending balance 172  
Accumulated Other Comprehensive Items [Member]    
Total Stockholders' Equity [Roll Forward]    
Beginning balance (26,715) (49,637)
Other comprehensive income (loss) before reclassifications 5,342  
Reclassifications from AOCI 161  
Net current period other comprehensive income 5,503  
Ending balance $ (21,212) $ (44,542)