Victory Motorcycles Wind Down (Liability Balance) (Details) - Victory Motorcycles - Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Disposal Group, Including Discontinued Operation, Liabilities [Roll Forward]
Reserves balance as of December 31, 2017	$ 5,645
Expenses	2,630
Cash payments / scrapped inventory	(5,103)
Reserves balance as of June 30, 2018	3,172
Contract termination charges
Disposal Group, Including Discontinued Operation, Liabilities [Roll Forward]
Reserves balance as of December 31, 2017	3,187
Expenses	1,717
Cash payments / scrapped inventory	(3,768)
Reserves balance as of June 30, 2018	1,136
Inventory charges
Disposal Group, Including Discontinued Operation, Liabilities [Roll Forward]
Reserves balance as of December 31, 2017	777
Expenses	0
Cash payments / scrapped inventory	(73)
Reserves balance as of June 30, 2018	704
Other costs
Disposal Group, Including Discontinued Operation, Liabilities [Roll Forward]
Reserves balance as of December 31, 2017	1,681
Expenses	913
Cash payments / scrapped inventory	(1,262)
Reserves balance as of June 30, 2018	$ 1,332

Disposal Group, Including Discontinued Operation, Liabilities [Roll Forward]

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Amount of other expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount classified as liabilities attributable to disposal group held for sale or disposed of.

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Increase (decrease) in cash associated with the entity's discontinued operations.

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