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International Operations and Geographic Information (Schedule of Selected Financial Information for International Operations) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 676,836 | $ 628,402 | $ 603,593
Income from operations | 50,737 | 45,349 | 49,456
Identifiable assets | 438,476 | 404,339 | 381,665
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 236,839 | 227,568 | 216,201
Income from operations | 14,822 | 14,470 | 19,362
Income before income taxes | 16,241 | 13,731 | 20,051
Identifiable assets | $ 205,317 | $ 179,263 | $ 155,188

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