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Segment Reporting (Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Sales: |  |  |
Total net sales | $ 824,444 | $ 695,977 | $ 644,812
Long-term Assets: |  |  |
Total long-term assets | 255,668 | 153,636 |
Total long-term assets | 255,668 | 153,636 |
North America [Member] |  |  |
Net Sales: |  |  |
Total net sales | 471,770 | 428,046 | 369,032
Long-term Assets: |  |  |
Total long-term assets | 89,997 | 73,835 |
South America [Member] |  |  |
Net Sales: |  |  |
Total net sales | 94,533 | 82,589 | 95,258
Long-term Assets: |  |  |
Total long-term assets | 58,989 | 63,497 |
Europe and Other [Member] |  |  |
Net Sales: |  |  |
Total net sales | 258,141 | 185,342 | $ 180,522
Long-term Assets: |  |  |
Total long-term assets | $ 106,682 | $ 16,304 |

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