CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (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 EARNINGS (UNAUDITED) [Abstract]
Sales	$ 305,644	$ 226,760	$ 585,180	$ 421,156
Cost of sales	229,111	169,395	441,110	317,599
Gross profit	76,533	57,365	144,070	103,557
Selling, general and administrative expenses	40,963	28,348	77,188	55,087
Legal expenses	340		340
Acquisition expenses	1,375	0	8,693
Operating income	33,855	29,017	57,849	48,470
Interest income	14	33	46	61
Interest expense	(3,125)	(63)	(6,464)	(233)
Other (expense) income, net	(293)	(158)	(754)	(93)
Earnings before income tax provision	30,451	28,829	50,677	48,205
Income tax provision	11,138	10,378	20,470	17,354
Net earnings	$ 19,313	$ 18,451	$ 30,207	$ 30,851
Net earnings per share:
Basic (in dollars per share)	$ 0.57	$ 0.61	$ 0.93	$ 1.01
Diluted (in dollars per share)	$ 0.57	$ 0.60	$ 0.92	$ 1.00
Dividends per share (in dollars per share)	$ 0.125	$ 0.125	$ 0.250	$ 0.250