Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net sales	$ 177,812	$ 165,614	$ 310,348	$ 289,434
Cost of sales	94,313	88,828	169,900	158,620
Gross profit	83,499	76,786	140,448	130,814
Operating expenses:
Research and development and other engineering	6,945	5,700	12,939	10,441
Selling	19,819	16,610	36,895	31,483
General and administrative	25,454	20,524	47,076	37,456
Loss on sale of assets	73	15	48	404
Total operating expenses	52,291	42,849	96,958	79,784
Income from operations	31,208	33,937	43,490	51,030
Loss in equity method investment, before tax	(69)	(131)	(82)	(275)
Interest income, net	108	26	179	37
Income from continuing operations before taxes	31,247	33,832	43,587	50,792
Provision for income taxes from continuing operations	11,754	12,773	17,016	19,903
Income from continuing operations, net of tax	19,493	21,059	26,571	30,889
Loss from discontinued operations, net of tax		(14,356)		(14,986)
Net income	$ 19,493	$ 6,703	$ 26,571	$ 15,903
Basic
Continuing operations (in dollars per share)	$ 0.39	$ 0.43	$ 0.53	$ 0.63
Discontinued operations (in dollars per share)		$ (0.29)		$ (0.30)
Net income (in dollars per share)	$ 0.39	$ 0.14	$ 0.53	$ 0.32
Diluted
Continuing operations (in dollars per share)	$ 0.39	$ 0.42	$ 0.53	$ 0.62
Discontinued operations (in dollars per share)		$ (0.29)		$ (0.30)
Net income (in dollars per share)	$ 0.39	$ 0.14	$ 0.53	$ 0.32
Number of shares outstanding
Basic (in shares)	49,404	49,417	49,753	49,403
Diluted (in shares)	49,456	49,598	49,809	49,559
Cash dividends declared per common share (in dollars per share)	$ 0.125	$ 0.10	$ 0.25	$ 0.20