Victory Motorcycles Wind Down (Liability Balance) (Details) - Victory Motorcycles - Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Disposal Group, Including Discontinued Operation, Liabilities [Roll Forward]
Reserves balance as of January 1, 2017	$ 0
Expenses	40,371
Cash payments / scrapped inventory	(32,313)
Reserves balance as of September 30, 2017	8,058
Contract termination charges
Disposal Group, Including Discontinued Operation, Liabilities [Roll Forward]
Reserves balance as of January 1, 2017	0
Expenses	19,196
Cash payments / scrapped inventory	(16,616)
Reserves balance as of September 30, 2017	2,580
Inventory charges
Disposal Group, Including Discontinued Operation, Liabilities [Roll Forward]
Reserves balance as of January 1, 2017	0
Expenses	12,680
Cash payments / scrapped inventory	(8,892)
Reserves balance as of September 30, 2017	3,788
Other costs
Disposal Group, Including Discontinued Operation, Liabilities [Roll Forward]
Reserves balance as of January 1, 2017	0
Expenses	8,495
Cash payments / scrapped inventory	(6,805)
Reserves balance as of September 30, 2017	$ 1,690