Commitments and Contingencies (Details)	6 Months Ended
	Jun. 30, 2018 CAD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Other Commitments [Line Items]
Event of default, loan due In full, term	90 days
Portion that company might be obligated to repay in the event franchisees defaulted		$ 43,000,000
Fair value of franchisee-related borrowings		500,000
Loan facility to franchisees, maximum commitment amount		85,000,000.0
Loss contingency accrual		1,800,000	$ 7,300,000
Reserve for unfunded loan commitments		700,000	600,000
Unused credit card lines
Other Commitments [Line Items]
Remaining credit available		348,900,000	$ 354,500,000
Minimum
Other Commitments [Line Items]
Range of possible loss not accrued		0
Loss contingency, estimate of possible loss		2,000,000
Maximum
Other Commitments [Line Items]
Range of possible loss not accrued		1,000,000
Loss contingency, estimate of possible loss		$ 5,000,000
Franchise Loan Facility
Other Commitments [Line Items]
Loan facility maximum Canadian sub facility commitment amount	$ 25,000,000