Quarterly Financial Information (Summary Of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 986,766		$ 1,188,037		$ 1,185,002		$ 1,103,531		$ 1,135,871		$ 1,253,227		$ 998,576		$ 1,027,676		$ 4,463,336	[1]	$ 4,415,350	[1]	$ 3,759,484	[1]
Gross profit	236,188		311,276		353,181		284,546		362,849		361,520		305,971		287,010		1,185,191		1,317,350		1,101,438
Income (loss) from operations	181,145		254,028		295,374		229,280		302,387		306,761		266,788		248,055		959,827		1,123,991		953,464
Net income	$ 110,969		$ 183,604		$ 205,095		$ 146,342		$ 183,291		$ 167,757		$ 169,443		$ 158,032		$ 646,010		$ 678,523		$ 610,425
Basic earnings per common share	$ 0.85	[2]	$ 1.39	[2]	$ 1.55	[2]	$ 1.10	[2]	$ 1.38	[2]	$ 1.26	[2]	$ 1.27	[2]	$ 1.18	[2]	$ 4.88		$ 5.09		$ 4.57
Diluted earnings per common share	$ 0.84	[2]	$ 1.39	[2]	$ 1.54	[2]	$ 1.10	[2]	$ 1.37	[2]	$ 1.25	[2]	$ 1.26	[2]	$ 1.18	[2]	$ 4.86		$ 5.07		$ 4.55

[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.