Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance, beginning of period	$ 53,391
Balance, end of period	55,947	$ 53,391
Motorcycles
Goodwill [Roll Forward]
Balance, beginning of period	53,391	54,182	$ 27,752
Business acquisitions	0	0	28,567
Currency translation	2,556	(791)	(2,137)
Balance, end of period	55,947	53,391	$ 54,182
Financial Services
Goodwill [Roll Forward]
Balance, beginning of period	0
Balance, end of period	$ 0	$ 0