CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF EARNINGS [Abstract]
Sales	$ 1,281,200	$ 932,135	$ 645,643
Cost of sales	971,453	705,078	487,125
Gross profit	309,747	227,057	158,518
Selling, general and administrative expenses	157,625	110,733	89,859
Acquisition expenses	8,693	7,066	0
Litigation reserve	3,377	1,780	1,000
Operating income	140,052	107,478	67,659
Interest income	421	116	54
Interest expense	(12,436)	(1,643)	(562)
Other (expense) income, net	(2,082)	(482)	294
Earnings from continuing operations before income tax provision	125,955	105,469	67,445
Income tax provision	44,098	39,498	23,914
Earnings from continuing operations	81,857	65,971	43,531
Earnings from discontinued operations, net of tax	0	0	292
Net earnings	$ 81,857	$ 65,971	$ 43,823
Basic earnings per share
Earnings from continuing operations (in dollars per share)	$ 2.48	$ 2.17	$ 1.45
Earnings from discontinued operations (in dollars per share)	$ 0	$ 0	$ 0.01
Net earnings (in dollars per share)	$ 2.48	$ 2.17	$ 1.46
Diluted earnings per share
Earnings from continuing operations (in dollars per share)	$ 2.45	$ 2.14	$ 1.44
Earnings from discontinued operations (in dollars per share)	$ 0	$ 0	$ 0.01
Net earnings (in dollars per share)	$ 2.45	$ 2.14	$ 1.45