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Credit Facilities and Long-term Debt (Credit Facilities and Long-term Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jul. 24, 2017
Debt Instrument [Line Items]      
Floor plan notes payable: non-trade $ 1,875,462 $ 1,802,252  
Floor plan notes payable 142,606 116,774  
Total floor plan debt 2,018,068 1,919,026  
Total long-term debt outstanding 1,325,750 1,054,271  
Other Long-term Debt 12,195 12,512  
Less: unamortized debt issuance costs (6,575) (6,919)  
Less: current maturities (net of current debt issuance costs) (24,098) (18,876)  
Long-term debt 1,295,077 1,028,476  
Real Estate Mortgages      
Debt Instrument [Line Items]      
Total long-term debt outstanding 642,602 469,969  
Senior Notes | Senior Notes Due 2025      
Debt Instrument [Line Items]      
Total long-term debt outstanding $ 300,000 300,000 $ 300,000
Stated interest rate (percent) 5.25%   5.25%
Used Vehicle Inventory Financing | Line of Credit      
Debt Instrument [Line Items]      
Total long-term debt outstanding $ 50,000 177,222  
Revolving Credit Facility | Line of Credit      
Debt Instrument [Line Items]      
Total long-term debt outstanding $ 320,953 $ 94,568