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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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | 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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net sales | $ 189,600 | $ 183,100 | $ 198,000 | $ 186,700 | $ 194,300 | $ 194,600 | $ 191,900 | $ 180,100 | $ 197,400 | $ 200,300 | $ 189,700 | $ 200,000 | $ 757,414 | $ 760,941 |  | $ 787,287
Gross profit | 72,400 | 68,000 | 77,400 | 72,800 | 79,000 | 79,700 | 78,500 | 68,300 | 77,000 | 78,100 | 73,900 | 85,200 | 290,554 | 305,396 |  | 314,166
Net income | $ 8,700 | $ 4,700 | $ (7,400) | $ 11,500 | $ 8,200 | $ 9,500 | $ (33,700) | $ 47,000 | $ (7,200) | $ 16,700 | $ 8,800 | $ 16,700 | $ 17,517 | $ 30,977 |  | $ 34,938
Basic earnings per share | $ 0.27 | $ 0.15 | $ (0.23) | $ 0.36 | $ 0.27 | $ 0.30 | $ (1.08) | $ 1.50 | $ (0.23) | $ 0.53 | $ 0.28 | $ 0.54 | $ 0.55 | $ 0.99 |  | $ 1.12
Diluted earnings per share | $ 0.27 | $ 0.15 | $ (0.23) | $ 0.36 | $ 0.26 | $ 0.30 | $ (1.08) | $ 1.49 | $ (0.23) | $ 0.53 | $ 0.28 | $ 0.53 | $ 0.55 | $ 0.97 | [1] | $ 1.11
Cash dividends per share | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.13 | $ 0.12 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock prices: | $ 37.25 | $ 36.53 | $ 33.90 | $ 29.87 | $ 22.68 | $ 22.78 | $ 24.70 | $ 25.90 | $ 25.70 | $ 27.68 | $ 27.90 | $ 25.09 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock prices: | $ 33.81 | $ 32.27 | $ 27.48 | $ 23.21 | $ 20.11 | $ 17.66 | $ 17.15 | $ 22.35 | $ 17.24 | $ 17.82 | $ 23.54 | $ 21.84 |  |  |  |
[1] | Due to a loss from continuing operations in 2012, the calculation of diluted income per share cannot be calculated by dividing net income by the diluted shares in the table above. See Statement of Income.

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