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Quarterly Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Net income (loss) and earnings (loss) per share |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 391,389 | $ 404,354 | $ 384,693 | $ 397,352 | $ 391,905 | $ 416,493 | $ 397,985 | $ 396,771 | $ 1,577,788 | $ 1,603,154 | $ 1,455,331
Gross profit | 52,609 | 59,192 | 40,878 | 60,970 | 53,610 | 54,916 | 37,500 | 60,167 | 213,649 | 206,193 | 186,247
Net income loss | $ 6,970 | $ 20,099 | $ 13,432 | $ 18,878 | $ 9,741 | $ 13,026 | $ 2,501 | $ 17,426 |  |  |
Diluted | $ 0.16 | $ 0.46 | $ 0.31 | $ 0.43 | $ 0.22 | $ 0.28 | $ 0.05 | $ 0.38 | $ 1.36 | $ 0.93 | $ 1.17

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