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Finance Receivables (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jun. 26, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivable individually evaluated for impairment $ 0 $ 0  
Unconsolidated VIEs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Principal balance of finance receivable     $ 301,800,000
Wholesale      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unused lines of credit, wholesale 1,270,000,000 1,320,000,000  
Financing receivable individually evaluated for impairment 0 0  
Financing receivable on non-accrual status 0 0  
Retail      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Approved but unfunded retail loans 166,300,000 177,900,000  
Financing receivable individually evaluated for impairment $ 0 $ 0  
Finance receivables | Geographic Concentration Risk | Texas      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration risk (as a percent) 11.00% 11.00%