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Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jul. 24, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Total long-term debt outstanding $ 1,015,912   $ 793,065
Less: unamortized debt issuance costs (6,960)   (2,184)
Less: current maturities (net of current debt issuance costs) (17,619)   (20,965)
Long-term debt 991,333   769,916
Real estate mortgages      
Debt Instrument [Line Items]      
Total long-term debt outstanding 476,559   428,367
5.25% Senior Notes due 2025 | Senior Notes Due 2025      
Debt Instrument [Line Items]      
Total long-term debt outstanding $ 300,000 $ 300,000 0
Stated interest rate (percent) 5.25% 5.25%  
Used vehicle inventory financing facility and revolving lines of credit      
Debt Instrument [Line Items]      
Total long-term debt outstanding $ 226,654   353,507
Capital leases and other debt      
Debt Instrument [Line Items]      
Total long-term debt outstanding $ 12,699   $ 11,191