Intangible Franchise Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Intangible Franchise Rights [Roll Forward]
Intangible Franchise Rights, Beginning Balance	$ 284,876	$ 307,588
Additions through acquisitions	18,168	12,833
Disposition of Intangible Franchise Rights		(5,203)
Impairment of Intangible Franchise Rights	(19,332)	(29,823)
Intangible Franchise Rights, Ending Balance	285,632	284,876
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss)	1,920	(519)
U.S.
Intangible Franchise Rights [Roll Forward]
Intangible Franchise Rights, Beginning Balance	260,534	285,659
Additions through acquisitions	8,035	0
Disposition of Intangible Franchise Rights		(5,203)
Impairment of Intangible Franchise Rights	(12,588)	(19,922)
Intangible Franchise Rights, Ending Balance	255,981	260,534
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss)	0	0
U.K.
Intangible Franchise Rights [Roll Forward]
Intangible Franchise Rights, Beginning Balance	17,337	7,773
Additions through acquisitions	10,133	12,833
Disposition of Intangible Franchise Rights		0
Impairment of Intangible Franchise Rights	0	0
Intangible Franchise Rights, Ending Balance	29,483	17,337
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss)	2,013	(3,269)
Brazil
Intangible Franchise Rights [Roll Forward]
Intangible Franchise Rights, Beginning Balance	7,005	14,156
Additions through acquisitions	0	0
Disposition of Intangible Franchise Rights		0
Impairment of Intangible Franchise Rights	(6,744)	(9,901)
Intangible Franchise Rights, Ending Balance	168	7,005
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss)	$ (93)	$ 2,750