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Quarterly Financial Data (Schedule of Quarterly Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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, 2009 | Sep. 30, 2009 | Jun. 30, 2009 | Mar. 31, 2009 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Net sales | $ 202,600 | $ 206,700 | $ 198,600 | $ 206,800 | $ 199,800 | $ 192,200 | $ 193,700 | $ 180,100 | $ 194,000 | $ 186,700 | $ 182,100 | $ 174,900 | $ 814,696 | $ 765,769 | $ 737,621
Gross profit | 80,100 | 81,300 | 78,700 | 88,900 | 80,600 | 74,600 | 74,100 | 65,500 | 69,200 | 64,500 | 59,600 | 60,000 | 328,961 | 294,763 | 253,286
Net income/(loss) | $ (7,200) | $ 16,700 | $ 8,800 | $ 16,700 | $ 20,500 | $ 3,600 | $ 7,900 | $ 5,600 | $ 3,700 | $ (5,100) | $ (12,700) | $ (19,400) | $ 34,938 | $ 37,636 | $ (33,458)
Basic earnings per share | $ (0.23) | $ 0.53 | $ 0.28 | $ 0.54 | $ 0.66 | $ 0.12 | $ 0.25 | $ 0.18 | $ 0.12 | $ (0.17) | $ (0.41) | $ (0.64) | $ 1.12 | $ 1.21 | $ (1.09)
Diluted earnings per share | $ (0.23) | $ 0.53 | $ 0.28 | $ 0.53 | $ 0.66 | $ 0.12 | $ 0.25 | $ 0.18 | $ 0.12 | $ (0.17) | $ (0.41) | $ (0.64) | $ 1.11 | $ 1.21 | $ (1.09)
Cash dividends per share | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.12 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock prices: | $ 25.7 | $ 27.68 | $ 27.9 | $ 25.09 | $ 25.62 | $ 20.89 | $ 25.73 | $ 23.27 | $ 22.87 | $ 20.53 | $ 14.69 | $ 13.72 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock prices: | $ 17.24 | $ 17.82 | $ 23.54 | $ 21.84 | $ 18.68 | $ 15.06 | $ 16.0 | $ 18.32 | $ 16.39 | $ 10.05 | $ 7.95 | $ 5.05 |  |  |

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