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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 segment | Sep. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2010
Segment Information |  |  |  |  |  |
Number of reportable segments |  |  | 3 |  |  |
Segment Information |  |  |  |  |  |
Net sales | $ 172,113 | $ 162,366 | $ 512,550 | $ 472,713 |  |
Sales to Other Segments | 4,968 | 4,443 | 16,232 | 11,660 |  |
Income (Loss) from Operations | 21,990 | 24,882 | 62,647 | 68,373 |  |
Total Assets | 878,996 | 855,469 | 878,996 | 855,469 | 836,087 |
Cash and short-term investments | 187,471 | 265,162 | 187,471 | 265,162 | 213,817 | 335,049
North America |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 137,145 | 127,998 | 409,644 | 371,732 |  |
Sales to Other Segments | 969 | 1,093 | 3,783 | 3,905 |  |
Income (Loss) from Operations | 22,102 | 23,594 | 66,558 | 69,463 |  |
Total Assets | 568,878 | 608,350 | 568,878 | 608,350 | 540,082 |
Europe |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 31,880 | 31,761 | 94,236 | 93,206 |  |
Sales to Other Segments | 105 |  | 258 | 250 |  |
Income (Loss) from Operations | 1,172 | 2,801 | 889 | 3,997 |  |
Total Assets | 196,883 | 131,138 | 196,883 | 131,138 | 180,016 |
Asia/Pacific |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 2,851 | 2,370 | 7,958 | 7,062 |  |
Sales to Other Segments | 3,894 | 3,350 | 12,191 | 7,505 |  |
Income (Loss) from Operations | (1,043) | (410) | (1,860) | (1,674) |  |
Total Assets | 31,067 | 28,349 | 31,067 | 28,349 | 29,306 |
Administrative and all other |  |  |  |  |  |
Segment Information |  |  |  |  |  |
Net sales | 237 | 237 | 712 | 713 |  |
Income (Loss) from Operations | (241) | (1,103) | (2,940) | (3,413) |  |
Total Assets | 82,168 | 87,632 | 82,168 | 87,632 | 86,683 |
Cash and short-term investments | $ 107,300 | $ 177,500 | $ 107,300 | $ 177,500 | $ 68,500 |

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