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Credit Facilities and Long-term Debt (Narrative) (Details) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 24, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 25, 2018 USD ($) financial_institution finance_companies | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |
Total long-term debt outstanding |  | $ 1,325,750,000 |  | $ 1,054,271,000
Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Reduction Accounts Maximum Deposit Amount |  | 50,000,000 |  |
Principal Reduction Accounts Outstanding Amount |  | 0 |  |
Line of Credit | Syndicated Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number Of Financial Institutions | financial_institution |  |  | 20 |
Number Of Manufacturer Affiliated Finance Companies | finance_companies |  |  | 7 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,600,000,000.0 |  | 2,400,000,000.0
Line Of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option |  |  | $ 3,000,000,000.0 |
Senior Notes | Senior Notes Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt outstanding | $ 300,000,000 | $ 300,000,000 |  | 300,000,000
Stated interest rate (percent) | 5.25% | 5.25% |  |
Redemption percentage price (percent) | 100.00% |  |  |
Percentage of principal amount redeemable (percent) | 101.00% |  |  |
Used Vehicle Inventory Financing | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt outstanding |  | $ 50,000,000 |  | 177,222,000
Used Vehicle Inventory Financing | Line of Credit | Syndicated Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 135,000,000 |
Line Of Credit Facility, Option To Reallocate Commitment, Maximum Aggregate Commitment Threshold Percentage |  |  | 16.50% |
Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rate |  | 3.59% |  |
Total long-term debt outstanding |  | $ 320,953,000 |  | $ 94,568,000
Revolving Credit Facility | Line of Credit | Syndicated Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 450,000,000 |
Line Of Credit Facility, Option To Reallocate Commitment, Maximum Aggregate Commitment Threshold Percentage |  |  | 18.75% |
New Vehicle Floor Plan | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rate |  | 3.34% |  |
Reserve Commitment Percent |  | 95.00% |  |
Maximum Reserve Amount If Reserve Is Required |  | $ 15,000,000 |  |
New Vehicle Floor Plan | Line of Credit | Syndicated Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 2,000,000,000.0 |
Line Of Credit Facility, Accordian Feature, Increase Limit |  |  | $ 400,000,000 |
London Interbank Offered Rate (LIBOR) | Used Vehicle Inventory Financing | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |
London Interbank Offered Rate (LIBOR) | New Vehicle Floor Plan | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |

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