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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, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Selected Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 130,732 | $ 162,366 | $ 177,812 | $ 132,536 | $ 119,606 | $ 146,447 | $ 165,614 | $ 123,820 | $ 603,446 | $ 555,487 | $ 526,544
Cost of sales | 75,822 | 86,919 | 94,313 | 75,588 | 71,979 | 80,750 | 88,828 | 69,793 | 332,642 | 311,349 | 341,645
Gross profit | 54,910 | 75,447 | 83,499 | 56,948 | 47,627 | 65,697 | 76,786 | 54,027 | 270,804 | 244,138 | 184,899
Research and development and other engineering | 6,143 | 6,804 | 6,945 | 5,994 | 4,954 | 5,715 | 5,700 | 4,742 | 25,886 | 21,110 | 18,756
Selling | 18,041 | 18,633 | 19,819 | 17,075 | 15,865 | 15,946 | 16,610 | 14,872 | 73,568 | 63,293 | 58,790
General and administrative | 23,570 | 25,174 | 25,454 | 21,621 | 22,331 | 20,001 | 20,524 | 16,933 | 95,820 | 79,788 | 75,063
Impairment of goodwill | 1,282 |  |  |  | 6,292 |  |  |  | 1,282 | 6,292 |
Loss (gain) on sale of assets | 190 | (46) | 73 | (25) | 43 | (5,217) | 15 | 388 | 191 | (4,769) | 794
Income (Loss) from Operations | 5,684 | 24,882 | 31,208 | 12,283 | (1,858) | 29,252 | 33,937 | 17,092 | 74,057 | 78,424 | 31,496
Income (loss) in equity method investment |  | 4,471 | (69) | (14) | (106) | (153) | (131) | (144) | 4,389 | (535) | (194)
Interest income, net | 82 | 79 | 108 | 72 |  | 110 | 26 | 12 |  |  |
Income (loss) from continuing operations before income taxes | 5,766 | 29,432 | 31,247 | 12,341 | (1,964) | 29,209 | 33,832 | 16,960 | 78,786 | 78,037 | 31,477
Provision for income taxes from continuing operations | 818 | 10,052 | 11,754 | 5,263 | 2,535 | 10,801 | 12,773 | 7,130 | 27,886 | 33,239 | 17,356
Income from continuing operations, net of tax | 4,948 | 19,380 | 19,493 | 7,078 | (4,499) | 18,408 | 21,059 | 9,830 | 50,900 | 44,798 | 14,121
Loss from discontinued operations, net of tax |  |  |  |  |  | (1,226) | (14,356) | (631) |  | (16,212) | (1,904)
Net income | $ 4,948 | $ 19,380 | $ 19,493 | $ 7,078 | $ (4,499) | $ 17,182 | $ 6,703 | $ 9,199 | $ 50,900 | $ 28,586 | $ 12,217
Basic |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ (0.09) | $ 0.37 | $ 0.43 | $ 0.20 | $ 1.04 | $ 0.91 | $ 0.29
Discontinued operations (in dollars per share) |  |  |  |  |  | $ (0.02) | $ (0.29) | $ (0.01) |  | $ (0.33) | $ (0.04)
Net income (in dollars per share) | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ (0.09) | $ 0.35 | $ 0.14 | $ 0.19 | $ 1.04 | $ 0.58 | $ 0.25
Diluted |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ (0.09) | $ 0.37 | $ 0.42 | $ 0.20 | $ 1.04 | $ 0.90 | $ 0.29
Discontinued operations (in dollars per share) |  |  |  |  |  | $ (0.02) | $ (0.29) | $ (0.01) |  | $ (0.33) | $ (0.04)
Net income (in dollars per share) | $ 0.10 | $ 0.40 | $ 0.39 | $ 0.14 | $ (0.09) | $ 0.35 | $ 0.14 | $ 0.19 | $ 1.04 | $ 0.58 | $ 0.25
Cash dividends declared per common share (in dollars per share) | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.50 | $ 0.40 | $ 0.40

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- Definition This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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