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Accounts Receivable (Summary of Accounts Receivable) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross $ 418,932 $ 473,300
Less: Allowance (6,457) (5,281)
Less: Long-term portion of accounts receivable, net (53,465) (50,305)
Total accounts receivable, net $ 359,010 417,714
Threshold period for interest to bear on receivables 60 days  
Contracts in transit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross $ 179,556 233,506
Trade receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 51,009 47,450
Vehicle receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 40,120 43,937
Manufacturer receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 73,067 76,948
Auto loan receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross 74,123 69,859
Other receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable gross $ 1,057 $ 1,600