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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% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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