Commitments and Contingencies (Details)	9 Months Ended
	Sep. 30, 2017 CAD	Sep. 30, 2017 USD ($)	Sep. 18, 2017 USD ($)	Sep. 17, 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		$ 49,000,000
Fair value of franchisee-related borrowings		800,000
Loan facility to franchisees, maximum commitment amount			$ 85,000,000.0	$ 125,000,000
Loss contingency accrual		7,100,000
Reserve for unfunded loan commitments		600,000			$ 500,000
Unused credit card lines
Other Commitments [Line Items]
Remaining credit available		381,700,000			$ 366,400,000
Minimum
Other Commitments [Line Items]
Range of possible loss not accrued		0
Loss contingency, estimate of possible loss		500,000
Maximum
Other Commitments [Line Items]
Range of possible loss not accrued		1,400,000
Loss contingency, estimate of possible loss		$ 3,000,000
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