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Foreign Operations - Net Sales to External Customers by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Net sales | $ 200,724 | $ 182,717 | $ 578,783 | $ 509,938
United States |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Net sales | 107,546 | 84,756 | 313,029 | 243,801
Asia (excluding the PRC) |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Net sales | 29,613 | 36,888 | 79,157 | 91,755
Europe |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Net sales | 23,388 | 18,785 | 69,510 | 58,245
People's Republic of China (PRC) |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Net sales | 23,704 | 28,108 | 66,465 | 68,852
Latin America |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Net sales | 8,281 | 6,411 | 26,187 | 23,077
Other |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |
Net sales | $ 8,192 | $ 7,769 | $ 24,435 | $ 24,208

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