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Business Segment and Foreign Operations - Net Sales to External Customers by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 181,152 | $ 175,652 | $ 177,580 | $ 161,406 | $ 160,542 | $ 169,185 | $ 170,986 | $ 150,658 | $ 695,790 | $ 651,371 | $ 602,833
United States |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 345,838 | 338,338 | 287,678
Asia (excluding the PRC) |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 104,668 | 89,527 | 109,960
People's Republic of China (PRC) |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 83,036 | 77,224 | 74,475
Europe |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 79,183 | 74,113 | 65,579
Latin America |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 54,113 | 47,286 | 38,985
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 28,952 | $ 24,883 | $ 26,156

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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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