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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

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