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Foreign Operations - Net Sales to External Customers by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 170,303 | $ 182,717 | $ 162,523 | $ 164,698 | $ 181,152 | $ 175,652 | $ 177,580 | $ 161,406 | $ 680,241 | $ 695,790 | $ 651,371
United States |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 315,214 | 345,838 | 338,338
Asia (excluding the PRC) |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 124,657 | 104,668 | 89,527
People's Republic of China (PRC) |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 91,446 | 83,036 | 77,224
Europe |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 85,228 | 79,183 | 74,113
Latin America |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 30,954 | 54,113 | 47,286
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues from Geographical Segments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 32,742 | $ 28,952 | $ 24,883

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