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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Statements of Operations |  |  |
Net sales | $ 657,236 | $ 603,446 | $ 555,487
Cost of sales | 373,759 | 332,642 | 311,349
Gross profit | 283,477 | 270,804 | 244,138
Operating expenses: |  |  |
Research and development and other engineering | 35,919 | 25,886 | 21,110
Selling | 82,364 | 73,568 | 63,293
General and administrative | 100,973 | 95,820 | 79,788
Impairment of goodwill | 2,346 | 1,282 | 6,292
Loss (gain) on sale of assets | 166 | 191 | (4,769)
Total operating expenses | 221,768 | 196,747 | 165,714
Income from continuing operations | 61,709 | 74,057 | 78,424
Income (loss) in equity method investment, before tax |  | 4,389 | (535)
Interest income | 1,005 | 913 | 492
Interest expense | (793) | (573) | (344)
Income from continuing operations before taxes | 61,921 | 78,786 | 78,037
Provision for income taxes from continuing operations | 20,003 | 27,886 | 33,239
Income from continuing operations, net of tax | 41,918 | 50,900 | 44,798
Loss from discontinued operations, net of tax |  |  | (16,212)
Net income | $ 41,918 | $ 50,900 | $ 28,586
Basic |  |  |
Continuing operations (in dollars per share) | $ 0.87 | $ 1.04 | $ 0.91
Discontinued operations (in dollars per share) |  |  | $ (0.33)
Net income (in dollars per share) | $ 0.87 | $ 1.04 | $ 0.58
Diluted |  |  |
Continuing operations (in dollars per share) | $ 0.87 | $ 1.04 | $ 0.90
Discontinued operations (in dollars per share) |  |  | $ (0.33)
Net income (in dollars per share) | $ 0.87 | $ 1.04 | $ 0.58
Weighted average number of shares outstanding |  |  |
Basic (in shares) | 48,339 | 48,974 | 49,498
Diluted (in shares) | 48,412 | 49,023 | 49,612

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use; (3) to conduct internal product testing; (4) or to provide engineering support to customers in the form of testing services or product uses, specifications or requirements. + References No definition available. + Details
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