Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Sales	$ 4,516,629	$ 4,719,290	$ 4,479,648
Cost of sales	3,411,006	3,380,248	3,160,470
Gross profit	1,105,623	1,339,042	1,319,178
Operating expenses:
Selling and marketing	342,235	316,669	314,449
Research and development	185,126	166,460	148,458
General and administrative	306,442	209,077	203,248
Total operating expenses	833,803	692,206	666,155
Income from financial services	78,458	69,303	61,667
Operating income	350,278	716,139	714,690
Non-operating expense:
Interest expense	16,319	11,456	11,239
Equity in loss of other affiliates	6,873		4,124
Other expense, net	13,835	12,144	10
Income before income taxes	313,251	685,737	699,317
Provision for income taxes	100,303	230,376	245,288
Net income	$ 212,948	$ 455,361	$ 454,029
Net income per share:
Basic (in dollars per share)	$ 3.31	$ 6.90	$ 6.86
Diluted (in dollars per share)	$ 3.27	$ 6.75	$ 6.65
Weighted average shares outstanding:
Basic (in shares)	64,296	66,020	66,175
Diluted (in shares)	65,158	67,484	68,229