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, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 801,041		$ 821,175		$ 913,958		$ 1,034,867		$ 859,175		$ 968,372		$ 925,049		$ 867,252		$ 3,571,041	[1]	$ 3,619,848	[1]	$ 3,171,787	[1]
Gross profit	190,248		172,179		201,896		172,637		77,260		147,067		167,095		167,584		736,960		559,006		482,683
Income (loss) from operations	156,231		142,517		170,978		145,625		50,459		117,331		138,369		140,637		615,351		446,796		378,364
Net income	$ 95,277		$ 86,964		$ 115,501		$ 87,813		$ 26,443		$ 67,930		$ 81,049		$ 83,544		$ 385,555		$ 258,966		$ 221,393
Basic earnings per common share	$ 1.43	[2]	$ 1.30	[2]	$ 1.73	[2]	$ 1.32	[2]	$ 0.40	[2]	$ 1.02	[2]	$ 1.22	[2]	$ 1.26	[2]	$ 5.78		$ 3.89		$ 3.35
Diluted earnings per common share	$ 1.42	[2]	$ 1.30	[2]	$ 1.72	[2]	$ 1.31	[2]	$ 0.40	[2]	$ 1.01	[2]	$ 1.21	[2]	$ 1.25	[2]	$ 5.75		$ 3.87		$ 3.34

[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.