CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) [Abstract]
Sales	$ 231,714	$ 172,138	$ 652,870	$ 452,107
Cost of sales	177,824	128,823	495,422	342,828
Gross profit	53,890	43,315	157,448	109,279
Selling, general and administrative expenses	25,404	22,514	80,492	62,155
Acquisition expenses	4,521		4,521
Litigation reserve		1,000		1,000
Operating income	23,965	19,801	72,435	46,124
Interest income	28	18	89	48
Interest expense	(229)	(189)	(461)	(460)
Other income (expense), net	51	107	(43)	(39)
Earnings from continuing operations before income tax provision and discontinued operations	23,815	19,737	72,020	45,673
Income tax provision	9,390	7,105	26,744	16,442
Earnings from continuing operations before discontinued operations	14,425	12,632	45,276	29,231
Earnings (loss) from discontinued operations, net of tax	0	5	0	(12)
Net earnings	$ 14,425	$ 12,637	$ 45,276	$ 29,219
Net earnings per share:
Basic (in dollars per share)	$ 0.47	$ 0.42	$ 1.49	$ 0.98
Diluted (in dollars per share)	$ 0.47	$ 0.42	$ 1.47	$ 0.97
Dividends per share	$ 0.125	$ 0.125	$ 0.375	$ 0.375