Quarterly Financial Information (Summary Of Quarterly Financial Information) (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 Information [Abstract]
Net sales	$ 859,175		$ 968,372		$ 925,049		$ 867,252		$ 795,387		$ 779,677		$ 818,389		$ 778,334		$ 3,619,848	[1]	$ 3,171,787	[1]	$ 2,325,723	[1]
Gross profit	77,260		147,067		167,095		167,584		164,124		134,855		126,024		57,680		559,006		482,683		195,128
Income from operations	50,459		117,331		138,369		140,637		137,052		107,346		99,537		34,429		446,796		378,364		107,257
Net income	$ 26,443		$ 67,930		$ 81,049		$ 83,544		$ 84,073	[2]	$ 62,731	[2]	$ 56,942	[2]	$ 17,647	[2]	$ 258,966		$ 221,393		$ 52,995
Basic earnings per common share	$ 0.40	[2]	$ 1.02	[2]	$ 1.22	[2]	$ 1.26	[2]	$ 1.27		$ 0.95		$ 0.86		$ 0.27		$ 3.89		$ 3.35		$ 0.80
Diluted earnings per common share	$ 0.40	[2]	$ 1.01	[2]	$ 1.21	[2]	$ 1.25	[2]	$ 1.26	[2]	$ 0.95	[2]	$ 0.86	[2]	$ 0.27	[2]	$ 3.87		$ 3.34		$ 0.80

[1] Revenues are attributed to countries based on location of customer.

[2] Basic and diluted earnings per common share ("EPS") for each quarter is computed using the weighted average shares outstanding during that quarter, while EPS for the year is computed using the weighted average shares outstanding for the year. As a result, the sum of the EPS for each of the four quarters may not equal the EPS for the year.