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Assets Held for Sale (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jul. 02, 2017
Dec. 31, 2016
Apr. 02, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Accumulated other comprehensive loss $ (65,188) $ (39,067)  
Total assets held for sale 30,743 23,193  
Total liabilities held for sale 1,803 1,736  
Hirschmann Jv | Discontinued Operations, Held-for-sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Disposition, sales price   39,000 $ 39,000
Accumulated other comprehensive loss 8,900 15,700  
Receivables, net 4,881 4,551  
Inventories, net 3,902 2,848  
Other current assets 1,190 1,131  
Property, plant, and equipment 2,195 1,946  
Intangible assets 4,534 4,405  
Goodwill 5,477 5,477  
Other long-lived assets 32,495 26,766  
Total assets of disposal group 54,674 47,124  
Impairment of assets held for sale 23,931 (23,931)  
Total assets held for sale 30,743 23,193  
Accrued liabilities 1,409 1,288  
Postretirement benefits 394 448  
Total liabilities held for sale $ 1,803 $ 1,736