Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Net sales	$ 293,422	$ 297,837	$ 596,518	$ 587,427
Cost of sales	193,088	194,564	394,869	385,475
Selling and administrative expenses	66,208	69,499	134,510	137,462
Total operating costs and expenses	259,296	264,063	529,379	522,937
Operating income	34,126	33,774	67,139	64,490
Interest expense	2,435	2,350	4,803	6,005
Other expense (income), net	95	321	948	728
Income from continuing operations before income taxes	31,596	31,103	61,388	57,757
Income taxes	6,798	8,377	13,616	14,834
Income from continuing operations	24,798	22,726	47,772	42,923
Income (loss) from discontinued operations, net of income taxes	33	(394)	(734)	(1,519)
Net income	$ 24,831	$ 22,332	$ 47,038	$ 41,404
Basic:
Income from continuing operations	$ 0.46	$ 0.41	$ 0.87	$ 0.78
Loss from discontinued operations, net of income taxes	$ 0.00	$ (0.01)	$ (0.01)	$ (0.03)
Net income	$ 0.46	$ 0.40	$ 0.86	$ 0.75
Diluted:
Income from continuing operations	$ 0.45	$ 0.41	$ 0.86	$ 0.77
Loss from discontinued operations, net of income taxes	$ 0.00	$ (0.01)	$ (0.01)	$ (0.03)
Net income	$ 0.45	$ 0.40	$ 0.85	$ 0.74
Dividends	$ 0.10	$ 0.08	$ 0.20	$ 0.16
Weighted average common shares outstanding: [Abstract]
Basic	54,543,098	55,414,347	54,674,366	55,067,079
Diluted	55,150,806	56,288,447	55,303,192	55,948,098