Victory Motorcycles Wind Down (Narrative) (Details) - Victory Motorcycles - Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Charges related to the wind down plan	$ 1,242	$ 56,465	$ 10,683
Liability balance	$ 3,172	3,172		$ 5,645
Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Estimated charges		$ 10,000

Disposal Group, Including Discontinued Operation, Estimated Charges

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Amount of operating 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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