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Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
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
Quarterly Financial Data [Abstract]                      
Net sales $ 654,306 $ 670,824 $ 665,481 $ 629,500 $ 626,651 $ 642,764 $ 615,459 $ 550,732 $ 2,620,111 $ 2,435,606 $ 2,147,589
Gross profit 134,157 137,747 136,901 133,141 147,284 166,452 131,665 86,799 541,946 532,200 426,577
Income from operations 67,807 71,180 67,859 65,903 96,362 (12,342) 67,746 33,616 272,749 185,382 352,454
Net income $ 39,465 $ 41,777 $ 39,368 $ 37,417 $ 54,891 $ 93,320 $ 38,030 $ 19,194 $ 158,027 $ 205,435 $ 265,895
Basic earnings per share $ 0.41 $ 0.42 $ 0.39 $ 0.37 $ 0.54 $ 0.92 $ 0.37 $ 0.19 $ 1.59 $ 2.02 $ 2.62
Diluted earnings per share $ 0.40 $ 0.42 $ 0.39 $ 0.37 $ 0.54 $ 0.91 $ 0.37 $ 0.19 $ 1.57 $ 2.00 $ 2.60
Stock price-high $ 27.16 $ 29.19 $ 29.88 $ 30.69 $ 27.08 $ 25.50 $ 26.48 $ 25.83 $ 30.69 $ 27.08  
Stock price-low $ 21.75 $ 21.05 $ 26.26 $ 25.96 $ 22.68 $ 21.19 $ 20.00 $ 20.63 $ 21.05 $ 20.00