Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Sales	$ 4,479,648	$ 3,777,068	$ 3,209,782
Cost of sales	3,160,470	2,656,189	2,284,485
Gross profit	1,319,178	1,120,879	925,297
Operating expenses:
Selling and marketing	314,449	270,266	210,367
Research and development	148,458	139,193	127,361
General and administrative	203,248	179,407	143,064
Total operating expenses	666,155	588,866	480,792
Income from financial services	61,667	45,901	33,920
Operating income	714,690	577,914	478,425
Non-operating expense (income):
Interest expense	11,239	6,210	5,932
Equity in loss of other affiliates	4,124	2,414	179
Other expense (income), net	10	(5,139)	(7,529)
Income before income taxes	699,317	574,429	479,843
Provision for income taxes	245,288	193,360	167,533
Net income from continuing operations	454,029	381,069	312,310
Loss from discontinued operations, net of tax	0	(3,777)	0
Net income	$ 454,029	$ 377,292	$ 312,310
Basic net income per share:
Continuing operations (in dollars per share)	$ 6.86	$ 5.56	$ 4.54
Loss from discontinued operations (in dollars per share)	$ 0.00	$ (0.05)	$ 0.00
Basic net income per share (in dollars per share)	$ 6.86	$ 5.51	$ 4.54
Diluted net income per share:
Continuing operations (in dollars per share)	$ 6.65	$ 5.40	$ 4.40
Loss from discontinued operations (in dollars per share)	$ 0.00	$ (0.05)	$ 0.00
Diluted net income per share (in dollars per share)	$ 6.65	$ 5.35	$ 4.40
Weighted average shares outstanding:
Basic (in shares)	66,175	68,535	68,849
Diluted (in shares)	68,229	70,546	71,005