Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Acquisition - Narrative (Details) $ in Thousands	Jan. 01, 2018 USD ($) Store	Jun. 30, 2018 Store	Mar. 31, 2018 Store	Dec. 31, 2017 Store	Jun. 30, 2017 Store	Mar. 31, 2017 Store	Dec. 31, 2016 Store
Business Acquisition [Line Items]
Number of owned and franchised locations \| Store		1,608	1,565	1,518	1,403	1,367	1,313
Assets Acquired From Franchisee
Business Acquisition [Line Items]
Number of owned and franchised locations \| Store	6
Acquisition, gross cash payments	$ 28,503
Loss on reacquired franchise rights	350
Consideration transferred	$ 28,153