Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Summary Of Quarterly Financial Information

	Three Months Ended
	March 31, 2012		June 30, 2012		September 30, 2012		December 31, 2012
Net sales	$	1,034,867	$	913,958	$	821,175	$	801,041
Gross profit	172,637		201,896		172,179		190,248
Income from operations	145,625		170,978		142,517		156,231
Net income	87,813		115,501		86,964		95,277
Basic earnings per common share (1)	$	1.32	$	1.73	$	1.30	$	1.43
Diluted earnings per common share (1)	$	1.31	$	1.72	$	1.30	$	1.42
	Three Months Ended
	March 31, 2011		June 30, 2011		September 30, 2011		December 31, 2011
Net sales	$	867,252	$	925,049	$	968,372	$	859,175
Gross profit	167,584		167,095		147,067		77,260
Income from operations	140,637		138,369		117,331		50,459
Net income	83,544		81,049		67,930		26,443
Basic earnings per common share (1)	$	1.26	$	1.22	$	1.02	$	0.40
Diluted earnings per common share (1)	$	1.25	$	1.21	$	1.01	$	0.40

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(1) 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.