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Quarterly financial data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Data (Unaudited) | (U.S. Dollars, in thousands, except per share data)
|  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |  |  | Year |
2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 116,041 |  |  | $ | 119,492 |  |  | $ | 114,752 |  |  | $ | 112,035 |  |  | $ | 462,320 |
Gross profit |  | $ | 94,102 |  |  | $ | 95,816 |  |  | $ | 92,379 |  |  | $ | 93,531 |  |  | $ | 375,828 |
Net income (loss) from continuing operations, net of tax |  | $ | 12,215 |  |  | $ | 13,967 |  |  | $ | 13,118 |  |  | $ | 14,636 |  |  | $ | 53,936 |
Net income (loss) from discontinued operations, net of tax |  | $ | (199 | ) |  | $ | (2,762 | ) |  | $ | (5,558 | ) |  | $ | 5,878 |  |  | $ | (2,641 | )
Net income (loss) |  | $ | 12,016 |  |  | $ | 11,205 |  |  | $ | 7,560 |  |  | $ | 20,514 |  |  | $ | 51,295 |
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax |  | $ | 0.65 |  |  | $ | 0.74 |  |  | $ | 0.69 |  |  | $ | 0.76 |  |  | $ | 2.84 |
Net income (loss) from discontinued operations, net of tax |  | $ | (0.01 | ) |  | $ | (0.15 | ) |  | $ | (0.29 | ) |  | $ | 0.30 |  |  | $ | (0.14 | )
Net income (loss) |  | $ | 0.64 |  |  | $ | 0.59 |  |  | $ | 0.40 |  |  | $ | 1.06 |  |  | $ | 2.70 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax |  | $ | 0.64 |  |  | $ | 0.73 |  |  | $ | 0.67 |  |  | $ | 0.74 |  |  | $ | 2.78 |
Net income (loss) from discontinued operations, net of tax |  | $ | (0.01 | ) |  | $ | (0.15 | ) |  | $ | (0.28 | ) |  | $ | 0.30 |  |  | $ | (0.14 | )
Net income (loss) |  | $ | 0.63 |  |  | $ | 0.58 |  |  | $ | 0.39 |  |  | $ | 1.04 |  |  | $ | 2.64 |
2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 113,060 |  |  | $ | 116,670 |  |  | $ | 117,306 |  |  | $ | 123,085 |  |  | $ | 470,121 |
Gross profit |  | $ | 90,720 |  |  | $ | 93,484 |  |  | $ | 93,452 |  |  | $ | 99,846 |  |  | $ | 377,502 |
Net income (loss) from continuing operations, net of tax |  | $ | (36,740 | ) |  | $ | 10,519 |  |  | $ | 12,951 |  |  | $ | 11,530 |  |  | $ | (1,740 | )
Net income (loss) from discontinued operations, net of tax |  | $ | 939 |  |  | $ | (561 | ) |  | $ | (573 | ) |  | $ | 862 |  |  | $ | 667 |
Net income (loss) |  | $ | (35,801 | ) (1) |  | $ | 9,958 |  |  | $ | 12,378 |  |  | $ | 12,392 | (2) |  | $ | (1,073 | )
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax |  | $ | (2.05 | ) |  | $ | 0.58 |  |  | $ | 0.70 |  |  | $ | 0.62 |  |  | $ | (0.10 | )
Net income (loss) from discontinued operations, net of tax |  | $ | 0.05 |  |  | $ | (0.03 | ) |  | $ | (0.03 | ) |  | $ | 0.05 |  |  | $ | 0.04 |
Net income (loss) |  | $ | (2.00 | ) |  | $ | 0.55 |  |  | $ | 0.67 |  |  | $ | 0.67 |  |  | $ | (0.06 | )
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations, net of tax |  | $ | (2.05 | ) |  | $ | 0.57 |  |  | $ | 0.69 |  |  | $ | 0.62 |  |  | $ | (0.10 | )
Net income (loss) from discontinued operations, net of tax |  | $ | 0.05 |  |  | $ | (0.03 | ) |  | $ | (0.03 | ) |  | $ | 0.04 |  |  | $ | 0.04 |
Net income (loss) |  | $ | (2.00 | ) |  | $ | 0.54 |  |  | $ | 0.66 |  |  | $ | 0.66 |  |  | $ | (0.06 | )
(1) | Includes $46 million of charges related to U.S. Government resolutions
(2) | Includes $10.5 million of charges related to U.S. Government resolutions

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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