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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - 2018 Acquisitions $ in Thousands	Sep. 30, 2018 USD ($)
Business Acquisition [Line Items]
Accounts receivable	$ 732
Inventories, net	179,973
Property and equipment, net	9,868
Other non-current assets	321,629
Floor plan notes payable	(10,779)
Other long-term liabilities	(2,342)
Assets acquired and liabilities assumed	$ 499,081

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Noncurrent Floor Plan Debt

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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