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Business Segment and Foreign Operations - Net Sales to External Customers by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Schedule of Revenues from Geographical Segments [Line Items] |  |
Net sales | $ 164,698 | $ 161,406
United States |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |
Net sales | 79,751 | 81,928
Asia (excluding the PRC) |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |
Net sales | 27,400 | 24,650
People's Republic of China (PRC) |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |
Net sales | 20,117 | 15,743
Europe |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |
Net sales | 19,130 | 17,424
Latin America |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |
Net sales | 10,030 | 15,645
Other |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |
Net sales | $ 8,270 | $ 6,016

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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