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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 segment | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Segment Information |  |  |  |
Number of reportable segments | 3 |  |  |
Segment Information |  |  |  |
Net sales | $ 154,535 | $ 158,734 |  |
Sales to Other Segments | 5,177 | 5,230 |  |
Income (loss) from operations | 9,013 | 13,508 |  |
Total Assets | 871,547 | 867,011 | 890,322 |
Cash and short-term investments | 141,965 | 160,092 | 175,553 | 213,817
North America |  |  |  |
Segment Information |  |  |  |
Net sales | 127,737 | 127,967 |  |
Sales to Other Segments | 761 | 1,372 |  |
Income (loss) from operations | 15,260 | 17,873 |  |
Total Assets | 580,882 | 546,112 | 583,501 |
Europe |  |  |  |
Segment Information |  |  |  |
Net sales | 23,917 | 28,237 |  |
Sales to Other Segments | 280 | 134 |  |
Income (loss) from operations | (4,180) | (2,372) |  |
Total Assets | 182,687 | 201,721 | 194,000 |
Asia/Pacific |  |  |  |
Segment Information |  |  |  |
Net sales | 2,644 | 2,372 |  |
Sales to Other Segments | 4,136 | 3,724 |  |
Income (loss) from operations | (1,184) | (654) |  |
Total Assets | 29,303 | 27,916 | 30,455 |
Administrative and all other |  |  |  |
Segment Information |  |  |  |
Net sales | 237 | 158 |  |
Income (loss) from operations | (883) | (1,339) |  |
Total Assets | 78,675 | 91,262 | 82,366 |
Cash and short-term investments | $ 62,500 | $ 87,400 | $ 91,900 |

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