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CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS AND RETAINED EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS AND RETAINED EARNINGS |  |  |  |  |  |  |  |
Net product sales | $ 101,988 |  | $ 108,156 |  | $ 212,267 |  | $ 217,919 |
Rental and royalty revenue | 898 |  | 983 |  | 1,905 |  | 2,040 |
Total revenue | 102,886 |  | 109,139 |  | 214,172 |  | 219,959 |
Product cost of goods sold | 66,972 |  | 72,858 |  | 139,141 |  | 147,763 |
Rental and royalty cost | 225 |  | 250 |  | 475 |  | 507 |
Total costs | 67,197 |  | 73,108 |  | 139,616 |  | 148,270 |
Product gross margin | 35,016 |  | 35,298 |  | 73,126 |  | 70,156 |
Rental and royalty gross margin | 673 |  | 733 |  | 1,430 |  | 1,533 |
Total gross margin | 35,689 |  | 36,031 |  | 74,556 |  | 71,689 |
Selling, marketing and administrative expenses | 26,487 |  | 25,022 |  | 54,454 |  | 52,261 |
Earnings from operations | 9,202 |  | 11,009 |  | 20,102 |  | 19,428 |
Other income (expense), net | 1,705 |  | (444) |  | 4,296 |  | 2,891 |
Earnings before income taxes | 10,907 |  | 10,565 |  | 24,398 |  | 22,319 |
Provision for income taxes | 2,538 |  | 3,054 |  | 6,960 |  | 6,034 |
Net earnings | 8,369 |  | 7,511 |  | 17,438 |  | 16,285 |
Net earnings per share (in dollars per share) | $ 0.14 |  | $ 0.12 |  | $ 0.29 |  | $ 0.27 |
Dividends per share (in dollars per share) | $ 0.08 | [1] | $ 0.08 | [1] | $ 0.16 | [1] | $ 0.16 | [1]
Average number of shares outstanding (in shares) | 59,667 |  | 60,652 |  | 59,785 |  | 60,728 |
Retained earnings at beginning of period | 35,598 |  | 80,128 |  | 80,210 |  | 114,269 |
Net earnings | 8,369 |  | 7,511 |  | 17,438 |  | 16,285 |
Cash dividends | (4,768) |  | (4,708) |  | (9,421) |  | (9,289) |
Stock dividends |  |  |  |  | (49,028) |  | (38,334) |
Retained earnings at end of period | $ 39,199 |  | $ 82,931 |  | $ 39,199 |  | $ 82,931 |
[1] | Does not include 3% stock dividend to shareholders of record on 3/5/13 and 3/6/12.

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