Asset Impairments (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets Impairments (Textual) [Abstract]
Goodwill, Impairment Loss								$ 55,400
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 9,800	$ 9,500	$ 19,200	$ 10,600	$ 200	$ 19,300	$ 30,000	30,100
Other Asset Impairment Charges							$ 2,800	1,300
Pre-tax impairment charges of real estate						$ 200
Increase in assumed risk free rate to estimate WACC						2.00%
Additional franchise rights impairment charge						$ 51,800
Pre tax impairment charges of other long lived assets								$ 800
WACC increased 200 bps [Member]
Assets Impairments (Textual) [Abstract]
Additional franchise rights impairment charge						33,200
U.S. | WACC increased 200 bps [Member]
Assets Impairments (Textual) [Abstract]
Additional franchise rights impairment charge						33,100
U.S. | Recession scenario [Member]
Assets Impairments (Textual) [Abstract]
Additional franchise rights impairment charge						50,998
U.K. | WACC increased 200 bps [Member]
Assets Impairments (Textual) [Abstract]
Additional franchise rights impairment charge						100
U.K. | Recession scenario [Member]
Assets Impairments (Textual) [Abstract]
Additional franchise rights impairment charge						$ 800