Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Net sales	$ 3,763,971	$ 3,911,790	$ 3,708,518
Cost of goods sold	3,209,845	3,311,960	3,161,276
Gross profit	554,126	599,830	547,242
Selling, general and administrative expenses	219,907	224,496	211,075
Rationalization charges	14,407	14,481	11,987
Income from operations	319,812	360,853	324,180
Interest and other debt expense before loss on early extinguishment of debt	66,926	74,827	67,394
Loss on early extinguishment of debt	0	1,474	2,068
Interest and other debt expense	66,926	76,301	69,462
Income before income taxes	252,886	284,552	254,718
Provision for income taxes	80,473	102,161	69,305
Net income	$ 172,413	$ 182,391	$ 185,413
Basic net income per share (in dollars per share)	$ 2.83	$ 2.88	$ 2.89
Diluted net income per share (in dollars per share)	2.81	2.86	2.87
Dividends per share (in dollars per share)	$ 0.64	$ 0.6	$ 0.56