Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Net sales	$ 312,099	$ 263,545
Cost of sales	214,557	177,715
Selling and administrative expenses	62,418	60,875
Total operating costs and expenses	276,975	238,590
Operating income	35,124	24,955
Interest expense	3,319	4,357
Other expense (income), net	234	966
Income from continuing operations before income taxes	31,571	19,632
Income taxes	8,819	4,199
Income from continuing operations	22,752	15,433
Loss from discontinued operations, net of income taxes (Note 2)	0	(1,961)
Net income	$ 22,752	$ 13,472
Basic:
Income from continuing operations (in dollars per share)	$ 0.42	$ 0.29
(Loss) income from discontinued operations, net of income taxes (in dollars per share)	$ 0.00	$ (0.04)
Net income (in dollars per share)	$ 0.42	$ 0.25
Diluted:
Income from continuing operations (in dollars per share)	$ 0.41	$ 0.28
(Loss) income from discontinued operations, net of income taxes (in dollars per share)	$ 0.00	$ (0.04)
Net income (in dollars per share)	$ 0.41	$ 0.24
Dividends (in dollars per share)	$ 0.11	$ 0.10
Weighted average common shares outstanding:
Basic (in shares)	54,650,481	54,739,465
Diluted (in shares)	55,972,753	55,524,560