Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Motorcycles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,793	$ 20,221
Accumulated Amortization	(14,883)	(9,674)
Total other intangible assets	6,910	10,547
Motorcycles | Distribution Rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,933	12,928
Accumulated Amortization	(13,933)	(9,157)
Total other intangible assets	$ 0	$ 3,771
Estimated useful life (years)	2 years	2 years
Motorcycles | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,860	$ 7,293
Accumulated Amortization	(950)	(517)
Total other intangible assets	$ 6,910	$ 6,776
Estimated useful life (years)	20 years	20 years
Financial Services
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets	$ 0	$ 0