Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Sales	$ 1,478,726	$ 1,185,067	$ 3,997,428	$ 3,298,840
Cost of sales	1,114,764	924,297	3,040,589	2,505,989
Gross profit	363,962	260,770	956,839	792,851
Operating expenses:
Selling and marketing	122,642	89,751	355,486	244,812
Research and development	63,129	47,568	175,887	136,256
General and administrative	79,421	85,257	245,998	219,403
Total operating expenses	265,192	222,576	777,371	600,471
Income from financial services	18,138	19,195	57,711	59,155
Operating income	116,908	57,389	237,179	251,535
Non-operating expense:
Interest expense	8,492	4,051	24,438	10,718
Equity in loss of other affiliates	1,603	1,798	4,839	5,439
Other expense (income), net	(2,368)	5,700	7,088	7,586
Income before income taxes	109,181	45,840	200,814	227,792
Provision for income taxes	27,293	13,528	59,796	77,425
Net income	$ 81,888	$ 32,312	$ 141,018	$ 150,367
Basic net income per share (in dollars per share)	$ 1.31	$ 0.50	$ 2.24	$ 2.33
Diluted net income per share (in dollars per share)	$ 1.28	$ 0.50	$ 2.21	$ 2.30
Weighted average shares outstanding:
Basic (in shares)	62,646	64,151	62,890	64,535
Diluted (in shares)	63,885	65,027	63,942	65,435