CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (UNAUDITED) [Abstract]
Sales	$ 340,345	$ 231,714	$ 925,526	$ 652,870
Cost of sales	261,085	177,824	702,436	495,422
Gross profit	79,260	53,890	223,090	157,448
Selling, general and administrative expenses	36,975	25,404	113,923	80,492
Legal expenses	0		340
Acquisition expenses	0	4,521	8,693	4,521
Operating income	42,285	23,965	100,134	72,435
Interest income	158	28	204	89
Interest expense	(2,973)	(229)	(9,438)	(461)
Other (expense) income, net	(513)	51	(1,266)	(43)
Earnings before income tax provision	38,957	23,815	89,634	72,020
Income tax provision	12,661	9,390	33,132	26,744
Net earnings	$ 26,296	$ 14,425	$ 56,502	$ 45,276
Net earnings per share:
Basic (in dollars per share)	$ 0.78	$ 0.47	$ 1.72	$ 1.49
Diluted (in dollars per share)	$ 0.78	$ 0.47	$ 1.70	$ 1.47
Dividends per share (in dollars per share)	$ 0.125	$ 0.125	$ 0.375	$ 0.375