Condensed Consolidated Statements of Income (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements of Income (unaudited)
Net sales	$ 253,875	$ 247,756	$ 520,513	$ 477,945
Cost of sales	197,645	185,785	403,636	361,271
Gross profit	56,230	61,971	116,877	116,674
Selling, general, administrative and engineering expenses	40,376	38,789	82,263	78,278
Asset impairment charge	0	2,170	0	2,170
Income from operations	15,854	21,012	34,614	36,226
Interest expense	42	58	90	94
Other income, net of expenses	627	366	1,477	773
Income before income taxes	16,439	21,320	36,001	36,905
Income taxes	6,010	7,215	13,314	12,642
Net income	10,429	14,105	22,687	24,263
Net income attributable to non-controlling interest	63	19	76	33
Net income attributable to controlling interest	$ 10,366	$ 14,086	$ 22,611	$ 24,230
Net income attributable to controlling interest:
Basic (in dollars per share)	$ 0.46	$ 0.62	$ 1.00	$ 1.07
Diluted (in dollars per share)	$ 0.45	$ 0.61	$ 0.98	$ 1.06
Weighted average number of common shares outstanding:
Basic (in shares)	22,691	22,576	22,667	22,571
Diluted (in shares)	23,041	22,992	23,047	22,956