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Credit Facilities and Long-term Debt (Narrative) (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 24, 2017 USD ($) | Dec. 31, 2017 USD ($) | Aug. 01, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Floor plan notes payable |  | $ 116,774,000 |  | $ 94,602,000
Total long-term debt outstanding |  | $ 1,054,271,000 |  | 793,065,000
Floor Plan Notes Payable | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 5.50% |  |
Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal reduction accounts, maximum deposit |  | $ 50,000,000 |  |
Principal reduction accounts, outstanding balance |  | $ 0 |  |
Line of Credit | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total financing commitment |  |  | $ 2,400,000,000 |
Number of financial institutions |  |  | 18 |
Number of manufacturer affiliated finance companies |  |  | 7 |
Higher borrowing capacity option |  |  | $ 2,750,000,000 |
Real Estate Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percent of total mortgage debt that is fixed |  | 78.90% |  |
Total long-term debt outstanding |  | $ 469,969,000 |  | 428,367,000
Real Estate Mortgages | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 2.80% |  |
Real Estate Mortgages | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 5.00% |  |
Capital Lease Obligations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt outstanding |  | $ 12,512,000 |  | 11,191,000
Capital Lease Obligations | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 3.10% |  |
Capital Lease Obligations | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 8.00% |  |
Senior Notes | 5.25% Senior notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 5.25% |  |  |
Total long-term debt outstanding | $ 300,000,000 | $ 300,000,000 |  | 0
Redemption percentage price (percent) | 100.00% |  |  |
Percentage of principal amount redeemable (percent) | 101.00% |  |  |
New vehicle floor plan | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Reserve commitment (in percent) |  | 95.00% |  |
Reserve amount requirement |  | $ 15,000,000 |  |
Annual interest rate (in percent) |  | 2.82% |  |
New vehicle floor plan | Line of Credit | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (in percent) |  | 1.25% |  |
New vehicle floor plan | Line of Credit | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total financing commitment |  |  | 1,900,000,000 |
Used vehicle inventory financing facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rate (in percent) |  | 3.07% |  |
Total long-term debt outstanding |  | $ 177,222,000 |  | 211,000,000
Used vehicle inventory financing facility | Line of Credit | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (in percent) |  | 1.50% |  |
Used vehicle inventory financing facility | Line of Credit | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total financing commitment |  |  | $ 500,000,000 |
Revolving lines of credit | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rate (in percent) |  | 3.07% |  |
Total long-term debt outstanding |  | $ 94,568,000 |  | $ 142,507,000
Revolving lines of credit | Line of Credit | LIBOR | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (in percent) |  | 1.25% |  |
Revolving lines of credit | Line of Credit | LIBOR | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (in percent) |  | 2.50% |  |
Other lines of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total financing commitment |  | $ 3,500,000 |  |
Long-term line of credit |  | $ 600,000 |  |
Other lines of credit | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rate (in percent) |  | 2.94% |  |

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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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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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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