Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
Net sales	$ 306,059	$ 298,643	$ 902,577	$ 886,069
Cost of sales	208,571	198,776	603,440	584,251
Selling and administrative expenses	67,817	65,679	202,327	203,140
Total operating costs and expenses	276,388	264,455	805,767	787,391
Operating income	29,671	34,188	96,810	98,678
Interest expense	3,243	1,902	8,046	7,906
Other expense (income), net	851	(501)	1,799	228
Income from continuing operations before income taxes	25,577	32,787	86,965	90,544
Income taxes	4,847	7,896	18,463	22,730
Income from continuing operations	20,730	24,891	68,502	67,814
Loss from discontinued operations, net of income taxes	(2,249)	(1,646)	(2,983)	(3,165)
Net income	$ 18,481	$ 23,245	$ 65,519	$ 64,649
Basic:
Income from continuing operations	$ 0.38	$ 0.45	$ 1.25	$ 1.23
Loss from discontinued operations, net of income taxes	$ (0.04)	$ (0.03)	$ (0.05)	$ (0.06)
Net income	$ 0.34	$ 0.42	$ 1.20	$ 1.17
Diluted:
Income from continuing operations	$ 0.38	$ 0.44	$ 1.24	$ 1.21
Loss from discontinued operations, net of income taxes	$ (0.04)	$ (0.03)	$ (0.05)	$ (0.06)
Net income	$ 0.34	$ 0.41	$ 1.19	$ 1.15
Dividends	$ 0.10	$ 0.08	$ 0.30	$ 0.24
Weighted average common shares outstanding: [Abstract]
Basic	54,508,387	55,834,038	54,618,636	55,325,541
Diluted	55,098,263	56,380,585	55,234,478	56,095,069