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Long-term Debt (Narrative) (Details) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 01, 2017 USD ($) financial_institution finance_companies | Jul. 24, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Total long-term debt outstanding |  |  | $ 1,015,912,000 |  | $ 793,065,000
Underwriting and other fees of issuance |  |  | 4,517,000 | $ 0 |
Senior Notes | Senior Notes Due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total long-term debt outstanding |  | $ 300,000,000 | $ 300,000,000 |  | 0
Stated interest rate (percent) |  | 5.25% | 5.25% |  |
Redemption percentage price (percent) |  | 100.00% |  |  |
Percentage of principal amount redeemable (percent) |  | 101.00% |  |  |
Underwriting and other fees of issuance |  | $ 5,000,000 |  |  |
Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total long-term debt outstanding |  |  | $ 226,654,000 |  | $ 353,507,000
Line of Credit | Amended Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total financing commitment | $ 2,400,000,000.0 |  |  |  |
Number of financial institutions | financial_institution | 18 |  |  |  |
Number of manufactured-affiliated finance companies | finance_companies | 7 |  |  |  |
Higher borrowing capacity option | $ 2,750,000,000.00 |  |  |  |
Line of Credit | Amended Revolving Credit Facility | New Vehicle Inventory Floor Plan Pricing |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total financing commitment | 1,900,000,000.0 |  |  |  |
Line of Credit | Amended Revolving Credit Facility | Used Vehicle Inventory Floor Plan Financing |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total financing commitment | 250,000,000 |  |  |  |
Line of Credit | Amended Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total financing commitment | $ 250,000,000 |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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