Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Sales	$ 1,297,473	$ 1,153,782
Cost of sales	973,992	911,291
Gross profit	323,481	242,491
Operating expenses:
Selling and marketing	117,707	114,313
Research and development	65,230	52,005
General and administrative	78,693	75,514
Total operating expenses	261,630	241,832
Income from financial services	21,425	20,430
Operating income	83,276	21,089
Non-operating expense:
Interest expense	8,048	7,914
Equity in loss of other affiliates	21,511	1,900
Other expense (income), net	(19,975)	11,608
Income (loss) before income taxes	73,692	(333)
Provision for income taxes	17,978	2,578
Net income (loss)	$ 55,714	$ (2,911)
Basic net income per share (in dollars per share)	$ 0.88	$ (0.05)
Diluted net income per share (in dollars per share)	$ 0.85	$ (0.05)
Weighted average shares outstanding:
Basic (in shares)	63,303	63,128
Diluted (in shares)	65,219	64,133