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Accumulated Other Comprehensive Items - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Other expense, net $ (246) $ (204)
Interest expense (1,732) (348)
Cost of revenues (83,114) (53,840)
Amortization of Actuarial Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Loss from Continuing Operations (139)  
Amortization of Prior Service Cost [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Loss from Continuing Operations (18)  
Cash Flow Hedges [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Loss from Continuing Operations (4)  
Reclassification out of Accumulated Other Comprehensive Items [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Loss from Continuing Operations (161) (126)
Reclassification out of Accumulated Other Comprehensive Items [Member] | Pension and Other Post-retirement Plans [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Total expense before income taxes (209) (170)
Provision for income taxes 52 59
Loss from Continuing Operations (157) (111)
Reclassification out of Accumulated Other Comprehensive Items [Member] | Amortization of Actuarial Loss [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Other expense, net (185) (135)
Reclassification out of Accumulated Other Comprehensive Items [Member] | Amortization of Prior Service Cost [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Other expense, net (24) (35)
Reclassification out of Accumulated Other Comprehensive Items [Member] | Cash Flow Hedges [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Total expense before income taxes (5) (23)
Provision for income taxes 1 8
Loss from Continuing Operations (4) (15)
Reclassification out of Accumulated Other Comprehensive Items [Member] | Cash Flow Hedges [Member] | Interest Rate Swap [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Interest expense (5) (12)
Reclassification out of Accumulated Other Comprehensive Items [Member] | Cash Flow Hedges [Member] | Forward Currency-Exchange Contracts [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]    
Cost of revenues $ 0 $ (11)