Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Sales	$ 745,909	$ 673,750
Cost of sales	529,261	478,787
Gross profit	216,648	194,963
Operating expenses:
Selling and marketing	54,493	45,133
Research and development	31,450	30,466
General and administrative	38,810	35,000
Total operating expenses	124,753	110,599
Income from financial services	10,074	7,183
Operating income	101,969	91,547
Non-operating expense (income):
Interest expense	1,473	1,512
Equity in loss of other affiliates	412	0
Other income, net	(2,468)	(2,577)
Income before income taxes	102,552	92,612
Provision for income taxes	27,088	32,534
Net income	$ 75,464	$ 60,078
Basic net income per share (in dollars per share)	$ 1.10	$ 0.88
Diluted net income per share ( in dollars per share)	$ 1.07	$ 0.85
Weighted average shares outstanding:
Basic (in shares)	68,793	68,637
Diluted (in shares)	70,762	70,825