Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Net sales	$ 1,167,921	$ 1,139,547	$ 2,843,691	$ 2,729,516
Cost of goods sold	980,096	960,776	2,416,433	2,321,371
Gross profit	187,825	178,771	427,258	408,145
Selling, general and administrative expenses	50,634	44,291	154,754	135,503
Rationalization charges	1,332	2,048	3,616	5,809
Income from operations	135,859	132,432	268,888	266,833
Interest and other debt expense before loss on early extinguishment of debt	16,982	16,005	47,776	47,622
Loss on early extinguishment of debt	0	0	2,068	38,704
Interest and other debt expense	16,982	16,005	49,844	86,326
Income before income taxes	118,877	116,427	219,044	180,507
Provision for income taxes	41,702	37,770	56,907	58,520
Net income	$ 77,175	$ 78,657	$ 162,137	$ 121,987
Earnings per share:
Basic net income per share	$ 1.22	$ 1.13	$ 2.51	$ 1.75
Diluted net income per share	$ 1.21	$ 1.13	$ 2.50	$ 1.74
Dividends per share	$ 0.14	$ 0.12	$ 0.42	$ 0.36
Weighted average number of shares:
Basic (in shares)	63,449	69,375	64,522	69,679
Effect of dilutive securities (in shares)	415	310	389	305
Diluted (in shares)	63,864	69,685	64,911	69,984