Consolidated Statements of Income (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Net sales	$ 325,394	$ 289,901	$ 972,098	$ 849,930
Cost of sales	210,864	184,989	621,401	540,833
Selling and administrative expenses	81,586	80,079	254,782	240,915
Total operating costs and expenses	292,450	265,068	876,183	781,748
Operating income	32,944	24,833	95,915	68,182
Interest expense	1,917	5,177	7,950	15,273
Other expense (income), net	(425)	773	378	2,161
Income before income taxes	31,452	18,883	87,587	50,748
Income taxes	8,207	3,779	22,938	8,992
Net income	$ 23,245	$ 15,104	$ 64,649	$ 41,756
Per common share: [Abstract]
Basic	$ 0.42	$ 0.27	$ 1.17	$ 0.75
Diluted	$ 0.41	$ 0.27	$ 1.15	$ 0.75
Dividends	$ 0.08	$ 0.08	$ 0.24	$ 0.24
Weighted average common shares outstanding: [Abstract]
Basic	55,834,038	55,346,517	55,325,541	55,428,865
Diluted	56,380,585	55,839,970	56,095,069	56,048,170