Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net sales	$ 880,029	$ 821,611	$ 1,675,770	$ 1,589,968
Cost of goods sold	751,869	706,282	1,436,337	1,360,594
Gross profit	128,160	115,329	239,433	229,374
Selling, general and administrative expenses	52,322	46,532	104,120	91,211
Rationalization charges	933	158	2,284	3,761
Income from operations	74,905	68,639	133,029	134,402
Interest and other debt expense before loss on early extinguishment of debt	15,445	16,028	30,794	31,618
Loss on early extinguishment of debt	0	38,704	2,068	38,704
Interest and other debt expense	15,445	54,732	32,862	70,322
Income before income taxes	59,460	13,907	100,167	64,080
Provision for income taxes	(69)	3,327	15,205	20,750
Net income	$ 59,529	$ 10,580	$ 84,962	$ 43,330
Earnings per share:
Basic net income per share	$ 0.93	$ 0.15	$ 1.31	$ 0.62
Diluted net income per share	$ 0.93	$ 0.15	$ 1.30	$ 0.62
Dividends per share	$ 0.14	$ 0.12	$ 0.28	$ 0.24
Weighted average number of shares:
Basic (in shares)	63,710	69,719	65,068	69,834
Effect of dilutive securities (in shares)	381	281	374	303
Diluted (in shares)	64,091	70,000	65,442	70,137