Goodwill and Intangible Assets (Schedule of Finite-Lived Intangible Assets Future Amortization Expense) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 4,200,000	$ 7,000,000	$ 2,776,000
Motorcycles
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018	384,000
2019	384,000
2020	384,000
2021	384,000
2022	384,000
Thereafter	4,990,000
Total other intangible assets	$ 6,910,000	$ 10,547,000