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Business Segment and Foreign Operations - Foreign Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Total net sales | $ 175,652 | $ 169,185 | $ 514,638 | $ 490,829
United States |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Total net sales | 85,762 | 88,243 | 253,259 | 263,053
Asia (excluding the PRC) |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Total net sales | 26,113 | 22,099 | 77,679 | 64,290
People's Republic of China (PRC) |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Total net sales | 23,437 | 19,899 | 61,015 | 59,978
Europe |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Total net sales | 18,877 | 19,389 | 56,041 | 53,716
Latin America |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Total net sales | 13,567 | 13,032 | 44,593 | 32,273
Other |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Total net sales | $ 7,896 | $ 6,523 | $ 22,051 | $ 17,519

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