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Victory Motorcycles Wind Down (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impact of wind down activities $ (719,000) $ 11,798,000  
Victory Motorcycles | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Charges related to the wind down plan 1,388,000 45,782,000  
Victory Motorcycles | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Charges related to the wind down plan 1,388,000 $ 45,782,000  
Liability balance 3,651,000   $ 5,645,000
Victory Motorcycles | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment | Minimum      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Estimated charges 10,000,000    
Victory Motorcycles | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment | Maximum      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Estimated charges $ 10,000,000