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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 527,064 $ 578,322
Less: Allowance for doubtful accounts (6,260) (7,386)
Less: Long-term portion of accounts receivable, net (41,166) (48,998)
Trade receivables $ 479,638 521,938
Period that contracts in transit are outstanding 10 days  
Threshold period for interest to bear on receivables 60 days  
Contracts in transit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 260,287 286,578
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 50,705 45,895
Vehicle receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 47,781 60,022
Manufacturer receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 91,826 96,141
Auto loan receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables 72,270 75,052
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 4,195 $ 14,634