Impairment and Closure Charges - Long-lived Tangible Asset Impairment and Closure Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Closure charges	$ 1,000	$ 700	$ 2,900	$ 700
Long-lived tangible asset impairment	1,600	17,200	1,700	17,200
Goodwill impairment	0	92,200	0	92,200
Tradename impairment	0	11,000	0	11,000
Impairment of reacquired franchise rights	0	3,300	0	3,300
Total impairment and closure charges	$ 2,571	$ 124,365	$ 4,581	$ 124,353