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Accounts Receivable (Summary of Accounts Receivable) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | $ 501,823 | $ 473,300
Less: Allowance | (6,145) | (5,281)
Less: Long-term portion of accounts receivable, net | (49,065) | (50,305)
Total accounts receivable, net | $ 446,613 | 417,714
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 gross | $ 225,564 | 233,506
Trade receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 45,243 | 45,193
Vehicle receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 53,166 | 43,937
Manufacturer receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 85,307 | 76,948
Auto loan receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | 75,651 | 69,859
Other receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable gross | $ 16,892 | $ 3,857

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