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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Selected Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 144,686 | $ 172,113 | $ 181,703 | $ 158,734 | $ 130,732 | $ 162,366 | $ 177,812 | $ 132,536 | $ 657,236 | $ 603,446 | $ 555,487
Cost of sales | 89,482 | 96,390 | 98,557 | 89,329 | 75,822 | 86,919 | 94,313 | 75,588 | 373,759 | 332,642 | 311,349
Gross profit | 55,204 | 75,723 | 83,146 | 69,405 | 54,910 | 75,447 | 83,499 | 56,948 | 283,477 | 270,804 | 244,138
Research and development and other engineering | 8,763 | 8,916 | 9,043 | 9,198 | 6,143 | 6,804 | 6,945 | 5,994 | 35,919 | 25,886 | 21,110
Selling | 21,109 | 20,941 | 19,881 | 20,432 | 18,041 | 18,633 | 19,819 | 17,075 | 82,364 | 73,568 | 63,293
General and administrative | 23,799 | 23,843 | 27,087 | 26,244 | 23,570 | 25,174 | 25,454 | 21,621 | 100,973 | 95,820 | 79,788
Impairment of goodwill | 2,346 |  |  |  | 1,282 |  |  |  | 2,346 | 1,282 | 6,292
Loss (gain) on sale of assets | 124 | 33 | (13) | 23 | 190 | (46) | 73 | (25) | 166 | 191 | (4,769)
Income from continuing operations | (937) | 21,990 | 27,148 | 13,508 | 5,684 | 24,882 | 31,208 | 12,283 | 61,709 | 74,057 | 78,424
Income (loss) in equity method investment |  |  |  |  |  | 4,471 | (69) | (14) |  | 4,389 | (535)
Interest income, net | 35 | 55 | 58 | 65 | 82 | 79 | 108 | 72 |  |  |
Income from continuing operations before taxes | (902) | 22,045 | 27,206 | 13,573 | 5,766 | 29,432 | 31,247 | 12,341 | 61,921 | 78,786 | 78,037
Provision for (benefit from) income taxes | (6,785) | 9,069 | 11,347 | 6,372 | 818 | 10,052 | 11,754 | 5,263 | 20,003 | 27,886 | 33,239
Net income | $ 5,883 | $ 12,976 | $ 15,859 | $ 7,201 | $ 4,948 | $ 19,380 | $ 19,493 | $ 7,078 | $ 41,918 | $ 50,900 | $ 28,586
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.12 | $ 0.27 | $ 0.33 | $ 0.15 | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ 0.87 | $ 1.04 | $ 0.58
Diluted (in dollars per share) | $ 0.12 | $ 0.27 | $ 0.33 | $ 0.15 | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ 0.87 | $ 1.04 | $ 0.58
Cash dividends declared per common share (in dollars per share) | $ 0.25 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.625 | $ 0.50 | $ 0.40

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