Commitments and Contingencies (Details)	6 Months Ended
	Jun. 30, 2017 CAD	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 26, 2010 $ / violation
Other Commitments [Line Items]
Event of default, loan due In full, term (in days)	90 days
Portion that company might be obligated to repay in the event franchisees defaulted		$ 52,600,000
Fair value of franchise related borrowings		900,000
Loan facility to franchisees, maximum commitment amount		125,000,000
Loss contingency accrual		6,300,000
Reserve for unfunded loan commitments		500,000	$ 500,000
Unused credit card lines
Other Commitments [Line Items]
Remaining credit available		378,400,000	$ 366,400,000
Minimum
Other Commitments [Line Items]
Range of possible loss not accrued		0
Loss contingency, estimate of possible loss		1,000,000
Maximum
Other Commitments [Line Items]
Range of possible loss not accrued		1,000,000
Loss contingency, estimate of possible loss		$ 4,000,000
Amendment | Franchise Loan Facility
Other Commitments [Line Items]
Loan facility maximum Canadian sub facility commitment amount | CAD	CAD 25,000,000
Margaret Korrow
Other Commitments [Line Items]
Statutory penalty damages, per violation | $ / violation				100