Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Sales	$ 1,185,067	$ 1,456,000	$ 3,298,840	$ 3,613,672
Cost of sales	924,297	1,040,377	2,505,989	2,584,904
Gross profit	260,770	415,623	792,851	1,028,768
Operating expenses:
Selling and marketing	89,751	91,169	244,812	240,510
Research and development	47,568	44,432	136,256	124,726
General and administrative	85,257	56,411	219,403	157,898
Total operating expenses	222,576	192,012	600,471	523,134
Income from financial services	19,195	19,065	59,155	51,345
Operating income	57,389	242,676	251,535	556,979
Non-operating expense:
Interest expense	4,051	2,966	10,718	8,848
Equity in loss of other affiliates	1,798	1,345	5,439	4,716
Other expense (income), net	5,700	(1,345)	7,586	8,776
Income before income taxes	45,840	239,710	227,792	534,639
Provision for income taxes	13,528	84,537	77,425	189,960
Net income	$ 32,312	$ 155,173	$ 150,367	$ 344,679
Basic net income per share (in dollars per share)	$ 0.50	$ 2.35	$ 2.33	$ 5.20
Diluted net income per share (in dollars per share)	$ 0.50	$ 2.30	$ 2.30	$ 5.09
Weighted average shares outstanding:
Basic (in shares)	64,151	65,912	64,535	66,222
Diluted (in shares)	65,027	67,368	65,435	67,781