Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 1,203,525	$ 1,228,444	$ 2,934,355	$ 3,001,626
Cost of goods sold	1,018,419	1,022,830	2,493,355	2,524,298
Gross profit	185,106	205,614	441,000	477,328
Selling, general and administrative expenses	54,113	55,451	162,969	170,625
Rationalization charges	9,070	2,528	10,754	4,978
Income from operations	121,923	147,635	267,277	301,725
Interest and other debt expense before loss on early extinguishment of debt	17,159	19,276	50,364	56,920
Loss on early extinguishment of debt	0	0	0	1,474
Interest and other debt expense	17,159	19,276	50,364	58,394
Income before income taxes	104,764	128,359	216,913	243,331
Provision for income taxes	34,448	45,083	71,047	84,576
Net income	$ 70,316	$ 83,276	$ 145,866	$ 158,755
Earnings per share:
Basic net income per share	$ 1.16	$ 1.31	$ 2.38	$ 2.50
Diluted net income per share	1.16	1.31	2.37	2.49
Dividends per share	$ 0.16	$ 0.15	$ 0.48	$ 0.45
Weighted average number of shares:
Basic (in shares)	60,417	63,448	61,222	63,480
Effect of dilutive securities (in shares)	279	266	271	347
Diluted (in shares)	60,696	63,714	61,493	63,827