Revenue Textual (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 65,810		$ 65,810		$ 52,142
Long-term deferred revenue	107,370		107,370		$ 98,459
Revenue, remaining performance obligation	149,200		149,200
Revenues	291,490	$ 269,930	$ 796,325	$ 719,814
Minimum
Disaggregation of Revenue [Line Items]
Franchise agreement initial term in years			5 years
Franchise fee in years			5 years
Maximum
Disaggregation of Revenue [Line Items]
Franchise agreement initial term in years			30 years
Franchise fee in years			10 years
Other Assets
Disaggregation of Revenue [Line Items]
Capitalized franchise sales commissions			$ 46,100
Selling, General and Administrative Expenses
Disaggregation of Revenue [Line Items]
Amortization expense and impairment loss	2,000		6,200
Corporate & Other
Disaggregation of Revenue [Line Items]
Revenues	3,677	$ 2,859	10,704	$ 7,971
Loyalty Programs
Disaggregation of Revenue [Line Items]
Deferred revenue	32,800		32,800
Long-term deferred revenue	$ 19,900		$ 19,900