Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net sales	$ 914,229	$ 917,336	$ 1,730,829	$ 1,773,182
Cost of goods sold	780,572	773,629	1,474,935	1,501,468
Gross profit	133,657	143,707	255,894	271,714
Selling, general and administrative expenses	54,407	56,765	108,858	115,175
Rationalization charges	959	862	1,684	2,449
Income from operations	78,291	86,080	145,352	154,090
Interest and other debt expense before loss on early extinguishment of debt	16,762	18,958	33,205	37,644
Loss on early extinguishment of debt	0	0	0	1,474
Interest and other debt expense	16,762	18,958	33,205	39,118
Income before income taxes	61,529	67,122	112,147	114,972
Provision for income taxes	19,285	23,119	36,599	39,493
Net income	$ 42,244	$ 44,003	$ 75,548	$ 75,479
Earnings per share:
Basic net income per share	$ 0.70	$ 0.69	$ 1.23	$ 1.19
Diluted net income per share	0.70	0.69	1.22	1.18
Dividends per share	$ 0.16	$ 0.15	$ 0.32	$ 0.30
Weighted average number of shares:
Basic (in shares)	60,473	63,525	61,631	63,511
Effect of dilutive securities (in shares)	255	349	268	388
Diluted (in shares)	60,728	63,874	61,899	63,899