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Assets Held for Sale - Summary of Major Assets and Liabilities Classified as held for Sale (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 01, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Total assets held for sale $ 23,193 $ 35,953 $ 23,193
Total liabilities held for sale 1,736 1,732 1,736
Discontinued Operations, Held-for-sale | Hirschmann Jv      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Receivables, net 4,551 5,937 4,551
Inventories, net 2,848 4,302 2,848
Other current assets 1,131 1,101 1,131
Property, plant, and equipment, less accumulated depreciation 1,946 2,348 1,946
Intangible assets, less accumulated amortization 4,405 4,589 4,405
Goodwill 5,477 5,477 5,477
Other long-lived assets 26,766 36,130 26,766
Total assets of disposal group 47,124 59,884 47,124
Impairment of assets held for sale (23,900) (23,931) (23,931)
Total assets held for sale 23,193 35,953 23,193
Accrued liabilities 1,288 1,325 1,288
Postretirement benefits 448 407 448
Total liabilities held for sale $ 1,736 $ 1,732 $ 1,736