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Intangible Franchise Rights and Goodwill - Roll-Forward of Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
BALANCE	$ 913,034	$ 876,763
Additions through acquisitions	72,462	32,002
Purchase price allocation adjustments	19
Disposals	(13,361)	(933)
Currency translation	(8,229)	5,202
BALANCE	963,925	913,034
Accumulated impairment	97,800	97,800	$ 97,800
U.S.
Goodwill [Roll Forward]
BALANCE	835,267	805,935
Additions through acquisitions	39,703	29,332
Purchase price allocation adjustments	19
Disposals	(13,361)	0
Currency translation	0	0
BALANCE	861,628	835,267
U.K.
Goodwill [Roll Forward]
BALANCE	65,034	57,054
Additions through acquisitions	28,475	2,575
Purchase price allocation adjustments	0
Disposals	0	0
Currency translation	(5,922)	5,405
BALANCE	87,587	65,034
Brazil
Goodwill [Roll Forward]
BALANCE	12,733	13,774
Additions through acquisitions	4,284	95
Purchase price allocation adjustments	0
Disposals	0	(933)
Currency translation	(2,307)	(203)
BALANCE	$ 14,710	$ 12,733

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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