CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Sales	$ 2,656,949	$ 1,991,139	$ 1,565,887
Cost of sales	1,916,366	1,460,926	1,172,668
Gross profit	740,583	530,213	393,219
Operating expenses:
Selling and marketing	178,725	142,353	111,137
Research and development	105,631	84,940	62,999
General and administrative	130,395	99,055	71,184
Total operating expenses	414,751	326,348	245,320
Income from financial services	24,092	16,856	17,071
Operating income	349,924	220,721	164,970
Non-operating expense (income):
Interest expense	3,987	2,680	4,111
(Gain) loss on securities available for sale		(825)	8,952
Other expense (income), net	(689)	325	733
Income before income taxes	346,626	218,541	151,174
Provision for income taxes	119,051	71,403	50,157
Net income	$ 227,575	$ 147,138	$ 101,017
Basic net income per share	$ 3.31	$ 2.20	$ 1.56
Diluted net income per share	$ 3.20	$ 2.14	$ 1.53
Weighted average shares outstanding:
Basic	68,792	66,900	64,798
Diluted	71,057	68,765	66,148