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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Impairment of assets held for sale |  | $ 0 | $ (23,931) | $ 0
Total assets held for sale | $ 23,193 | 0 | 23,193 |
Total liabilities held for sale | 1,736 | $ 0 | 1,736 |
Hirschmann Jv [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Receivables, net | 4,551 |  | 4,551 |
Inventories, net | 2,848 |  | 2,848 |
Other current assets | 1,131 |  | 1,131 |
Property, plant, and equipment, less accumulated depreciation | 1,946 |  | 1,946 |
Intangible assets, less accumulated amortization | 4,405 |  | 4,405 |
Goodwill | 5,477 |  | 5,477 |
Other long-lived assets | 26,766 |  | 26,766 |
Total assets of disposal group | 47,124 |  | 47,124 |
Impairment of assets held for sale | (23,900) |  | (23,931) |
Total assets held for sale | 23,193 |  | 23,193 |
Accrued liabilities | 1,288 |  | 1,288 |
Postretirement benefits | 448 |  | 448 |
Total liabilities held for sale | $ 1,736 |  | $ 1,736 |

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- Definition Amount of assets held-for-sale that are not part of a disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220 + Details
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- Definition Amount classified as intangible assets, excluding goodwill, attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2473-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
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