Selected 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
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.