Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Net sales	$ 1,228,444	$ 1,167,921	$ 3,001,626	$ 2,843,691
Cost of goods sold	1,022,830	980,096	2,524,298	2,416,433
Gross profit	205,614	187,825	477,328	427,258
Selling, general and administrative expenses	55,451	50,634	170,625	154,754
Rationalization charges	2,528	1,332	4,978	3,616
Income from operations	147,635	135,859	301,725	268,888
Interest and other debt expense before loss on early extinguishment of debt	19,276	16,982	56,920	47,776
Loss on early extinguishment of debt	0	0	1,474	2,068
Interest and other debt expense	19,276	16,982	58,394	49,844
Income before income taxes	128,359	118,877	243,331	219,044
Provision for income taxes	45,083	41,702	84,576	56,907
Net income	$ 83,276	$ 77,175	$ 158,755	$ 162,137
Earnings per share:
Basic net income per share (usd per share)	$ 1.31	$ 1.22	$ 2.50	$ 2.51
Diluted net income per share (usd per share)	$ 1.31	$ 1.21	$ 2.49	$ 2.50
Dividends per share (usd per share)	$ 0.15	$ 0.14	$ 0.45	$ 0.42
Weighted average number of shares:
Basic (in shares)	63,448	63,449	63,480	64,522
Effect of dilutive securities (in shares)	266	415	347	389
Diluted (in shares)	63,714	63,864	63,827	64,911