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Accounts Receivable and Contract Assets (Summary of Accounts Receivable) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 518,391	$ 578,322
Less: Allowance for doubtful accounts	(7,733)	(7,386)
Less: Long-term portion of accounts receivable, net	(26,663)	(48,998)
Accounts receivable, net	$ 483,995	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	$ 239,698	286,578
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, net	51,403	45,895
Vehicle receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	57,795	60,022
Manufacturer receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	97,173	96,141
Auto loan receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	67,402	75,052
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 4,920	$ 14,634

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