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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 513,682 $ 578,322
Less: Allowance for doubtful accounts (6,426) (7,386)
Less: Long-term portion of accounts receivable, net (36,567) (48,998)
Accounts receivable, net $ 470,689 521,938
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]    
Accounts receivable $ 240,998 286,578
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 52,336 45,895
Vehicle receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 56,473 60,022
Manufacturer receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 94,399 96,141
Auto loan receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 64,090 75,052
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 5,386 $ 14,634