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International Operations and Geographic Information (Schedule of Selected Financial Information for International Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 912,380 | $ 844,748 | $ 879,577
Income from operations | 88,738 | 67,620 | 66,528
Identifiable assets | 639,671 | 552,776 |
Non-US |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 254,144 | 232,291 | 243,108
Income from operations | 23,110 | 18,544 | 9,682
Income before income taxes | 22,476 | 18,720 | 15,840
Identifiable assets | $ 227,758 | $ 167,990 | $ 194,839

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