Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement [Abstract]
Net sales	$ 1,229,959	$ 1,169,355	$ 1,028,617
Cost of sales	812,192	772,398	678,186
Selling and administrative expenses	281,211	269,402	264,033
Total operating costs and expenses	1,093,403	1,041,800	942,219
Operating income	136,556	127,555	86,398
Interest expense	12,238	10,271	19,984
Other expense (income), net	2,671	395	2,609
Income from continuing operations before income taxes	121,647	116,889	63,805
Income taxes	23,350	25,316	9,827
Income from continuing operations	98,297	91,573	53,978
Loss from discontinued operations, net of income taxes of $(87), $1,164 and $931 respectively (Note 2)	(3,048)	(26,858)	(700)
Net income	$ 95,249	$ 64,715	$ 53,278
Basic:
Income from continuing operations (in dollars per share)	$ 1.80	$ 1.66	$ 0.97
Loss from discontinued operations, net of income taxes (in dollars per share)	$ (0.06)	$ (0.49)	$ (0.01)
Net income (in dollars per share)	$ 1.74	$ 1.17	$ 0.96
Diluted:
Income from continuing operations (in dollars per share)	$ 1.78	$ 1.64	$ 0.96
Loss from discontinued operations, net of income taxes (in dollars per share)	$ (0.06)	$ (0.48)	$ (0.01)
Net income (in dollars per share)	$ 1.72	$ 1.16	$ 0.95
Dividends	$ 0.40	$ 0.34	$ 0.32
Weighted average common shares outstanding:
Basic (in shares)	54,626,453	55,214,586	55,259,732
Diluted (in shares)	55,224,457	55,931,882	55,925,187