Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Income Statement [Abstract]
Net sales	$ 303,096	$ 289,590
Cost of sales	201,781	190,910
Selling and administrative expenses	68,302	67,963
Total operating costs and expenses	270,083	258,873
Operating income	33,013	30,717
Interest expense	2,368	3,655
Other expense (income), net	853	408
Income from continuing operations before income taxes	29,792	26,654
Income taxes	6,818	6,457
Income from continuing operations	22,974	20,197
Loss from discontinued operations, net of income tax benefits of $13 and $253	(767)	(1,125)
Net income	$ 22,207	$ 19,072
Basic:
Income from continuing operations	$ 0.42	$ 0.37
Loss from discontinued operations, net of income taxes	$ (0.01)	$ (0.02)
Net income	$ 0.41	$ 0.35
Diluted:
Income from continuing operations	$ 0.41	$ 0.36
Loss from discontinued operations, net of income taxes	$ (0.01)	$ (0.02)
Net income	$ 0.40	$ 0.34
Dividends	$ 0.10	$ 0.08
Weighted average common shares outstanding: [Abstract]
Basic	54,805,636	54,715,953
Diluted	55,455,579	55,603,892