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, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,135,871		$ 1,253,227		$ 998,576		$ 1,027,676		$ 951,625		$ 1,004,165		$ 939,047		$ 864,647		$ 4,415,350	[1]	$ 3,759,484	[1]	$ 3,571,041	[1]
Gross profit	362,849		361,520		305,971		287,010		295,671		304,471		273,487		227,809		1,317,350		1,101,438		736,960
Income (loss) from operations	302,387		306,761		266,788		248,055		257,580		266,602		235,227		194,055		1,123,991		953,464		615,351
Net income	$ 183,291		$ 167,757		$ 169,443		$ 158,032		$ 170,972		$ 170,290		$ 145,816		$ 123,347		$ 678,523		$ 610,425		$ 385,555
Basic earnings per common share	$ 1.38	[2]	$ 1.26	[2]	$ 1.27	[2]	$ 1.18	[2]	$ 1.28	[2],[3]	$ 1.28	[2],[3]	$ 1.09	[2],[3]	$ 0.92	[2],[3]	$ 5.09		$ 4.57		$ 2.89
Diluted earnings per common share	$ 1.37	[2]	$ 1.25	[2]	$ 1.26	[2]	$ 1.18	[2]	$ 1.27	[2],[3]	$ 1.27	[2],[3]	$ 1.09	[2],[3]	$ 0.92	[2],[3]	$ 5.07		$ 4.55		$ 2.88

[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.

[3] Per share data for the prior year periods have been restated to reflect the effect of a two-for-one stock split. See Note 8 for additional information.