Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Net sales	$ 3,708,518	$ 3,588,318	$ 3,509,227
Cost of goods sold	3,161,276	3,070,759	2,990,637
Gross profit	547,242	517,559	518,590
Selling, general and administrative expenses	211,075	183,390	156,752
Rationalization charges	11,987	8,660	7,717
Income from operations	324,180	325,509	354,121
Interest and other debt expense before loss on early extinguishment of debt	67,394	63,018	62,978
Loss on early extinguishment of debt	2,068	38,704	976
Interest and other debt expense	69,462	101,722	63,954
Income before income taxes	254,718	223,787	290,167
Provision for income taxes	69,305	72,441	96,994
Net income	$ 185,413	$ 151,346	$ 193,173
Basic net income per share (in dollars per share)	$ 2.89	$ 2.18	$ 2.76
Diluted net income per share (in dollars per share)	$ 2.87	$ 2.17	$ 2.75
Dividends per share (in dollars per share)	$ 0.56	$ 0.48	$ 0.44