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Selected Quarterly Financial 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, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Selected Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 697,804 |  | $ 726,742 |  | $ 701,730 |  | $ 640,583 |  | $ 573,766 |  | $ 603,750 |  | $ 571,183 |  | $ 520,772 |  | $ 2,766,859 |  | $ 2,269,471 |  | $ 1,930,330
Gross profit | 357,178 |  | 377,381 |  | 366,233 |  | 333,380 |  | 298,617 |  | 312,648 |  | 297,658 |  | 265,913 |  | 1,434,172 |  | 1,174,836 |  | 983,435
Pre-tax earnings | 140,769 |  | 155,319 |  | 150,182 |  | 128,811 |  | 107,144 |  | 120,702 |  | 112,125 |  | 90,669 |  | 575,081 |  | 430,640 |  | 297,490
Net earnings | $ 87,472 |  | $ 96,798 |  | $ 94,112 |  | $ 79,547 |  | $ 65,161 |  | $ 74,994 |  | $ 69,167 |  | $ 56,034 |  | $ 357,929 |  | $ 265,356 |  | $ 184,357
Basic earnings per share | $ 0.30 | [1] | $ 0.33 | [1] | $ 0.32 | [1] | $ 0.27 | [1] | $ 0.22 | [1] | $ 0.25 | [1] | $ 0.23 | [1] | $ 0.19 | [1] | $ 1.21 | [1] | $ 0.90 | [1] | $ 0.62
[1] | Note - Amounts may not foot due to rounding difference.

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