Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net sales	$ 158,734	$ 132,536
Cost of sales	89,329	75,588
Gross profit	69,405	56,948
Operating expenses:
Research and development and other engineering	9,198	5,994
Selling	20,432	17,075
General and administrative	26,244	21,621
Loss (gain) on sale of assets	23	(25)
Total operating expenses	55,897	44,665
Income from operations	13,508	12,283
Loss in equity method investment, before tax		(14)
Interest income, net	65	72
Income before taxes	13,573	12,341
Provision for income taxes	6,372	5,263
Net income	$ 7,201	$ 7,078
Earnings per common share:
Basic (in dollars per share)	$ 0.15	$ 0.14
Diluted (in dollars per share)	$ 0.15	$ 0.14
Number of shares outstanding
Basic (in shares)	48,273	50,107
Diluted (in shares)	48,337	50,165
Cash dividends declared per common share (in dollars per share)	$ 0.125	$ 0.125