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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

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