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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 35,002  
Other comprehensive income (loss), net of tax 209 $ 280
Ending balance, net of tax 22,096  
Foreign currency, net of tax    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance 674  
Other comprehensive income (loss), net of tax 6  
Ending balance, net of tax 680  
Defined benefit pension plan, net of tax    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (37,393)  
Other comprehensive income (loss), net of tax 203  
Ending balance, net of tax (37,190)  
Other, net of tax    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance 212  
Other comprehensive income (loss), net of tax 0  
Ending balance, net of tax 212  
Total Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (36,507)  
Other comprehensive income (loss), net of tax 209  
Ending balance, net of tax (36,298)  
Accumulated defined benefit plan adjustment, net gain (loss) attributable to parent    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Reclassification of actuarial loss 300  
Reclassification of actuarial loss, tax $ 100