Income Taxes - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Income Tax Contingency [Line Items]
Effective income tax rate (percent)	5.60%	24.50%
Effective income tax rate reconciliation, change in enacted tax rate, amount	$ 6,100
Income (loss), before tax	(108,600)
Deferred income tax expense (benefit)	24,172	$ (2,890)
Gross unrecognized tax benefit	6,200		$ 7,600
Expected change in unrecognized tax benefits	1,000
Accrued interest on income taxes	1,900		2,500
Accrued penalties on income taxes, less than	100		$ 100
Trade Names
Income Tax Contingency [Line Items]
Impairment	11,000
Franchised Units | Applebee's
Income Tax Contingency [Line Items]
Impairment of goodwill, nondeductible	$ 92,200