Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Sales	$ 1,456,000	$ 1,302,343	$ 3,613,672	$ 3,204,648
Cost of sales	1,040,377	914,069	2,584,904	2,253,043
Gross profit	415,623	388,274	1,028,768	951,605
Operating expenses:
Selling and marketing	91,169	87,567	240,510	227,315
Research and development	44,432	38,586	124,726	111,083
General and administrative	56,411	56,596	157,898	150,830
Total operating expenses	192,012	182,749	523,134	489,228
Income from financial services	19,065	17,048	51,345	42,313
Operating income	242,676	222,573	556,979	504,690
Non-operating expense (income):
Interest expense	2,966	2,835	8,848	8,686
Equity in loss of other affiliates	1,345	1,036	4,716	2,899
Other expense (income), net	(1,345)	252	8,776	(3,736)
Income before income taxes	239,710	218,450	534,639	496,841
Provision for income taxes	84,537	77,624	189,960	178,209
Net income	$ 155,173	$ 140,826	$ 344,679	$ 318,632
Basic net income per share (in dollars per share)	$ 2.35	$ 2.13	$ 5.20	$ 4.82
Diluted net income per share (in dollars per share)	$ 2.30	$ 2.06	$ 5.09	$ 4.68
Weighted average shares outstanding:
Basic (in shares)	65,912	66,261	66,222	66,051
Diluted (in shares)	67,368	68,328	67,781	68,125