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Acquisitions (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 01, 2018 store | Feb. 26, 2018 store | Aug. 07, 2017 store | May 01, 2017 store
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition expense recognized | $ | $ 0.2 | $ 3.5 | $ 4.3 | $ 5.7 |  |  |  |
Day Auto Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of stores acquired |  |  |  |  |  | 7 |  |
Prestige Auto Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of stores acquired |  |  |  |  | 6 |  |  |
Baierl Auto Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of stores acquired |  |  |  |  |  |  |  | 8
Downtown LA Auto Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of stores acquired |  |  |  |  |  |  | 7 |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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