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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	May 01, 2017 USD ($) store $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Sep. 12, 2016 store
Business Acquisition [Line Items]
Equity securities issued | $		$ 2,137	$ 0
Acquistion expense recognized | $		$ 2,100	$ 0
Baierl Auto Group
Business Acquisition [Line Items]
Number of stores acquired | store	8
Equity interests issued or issuable (in shares) | shares	22,446
Share issuance period	4 years
Equity securities issued | $	$ 2,100
Price of acquisition (in dollars per share) | $ / shares	$ 95.22
Carbone Auto Group
Business Acquisition [Line Items]
Number of stores acquired | store				9
Common Stock, Issued | Baierl Auto Group
Business Acquisition [Line Items]
Equity interests issued or issuable (in shares) | shares	4,489
Common Stock, Issuable | Baierl Auto Group
Business Acquisition [Line Items]
Equity interests issued or issuable (in shares) | shares	17,957

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
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-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
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-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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