Consolidated Statements of Comprehensive (Loss) Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Rental revenues	$ 105,939	$ 120,666	$ 121,934
Total revenues	689,268	910,178	780,931
Cost of revenues:
Total franchise expenses	238,972	312,754	330,619
Company restaurant expenses	111,550	123,272	5,872
Interest expense from finance leases	4,563	5,602	6,894
Other rental expenses	84,939	85,157	83,862
Total rental expenses	89,502	90,759	90,756
Financing expenses	528	579	597
Total cost of revenues	440,552	527,364	427,844
Gross profit	248,716	382,814	353,087
General and administrative expenses	144,791	162,815	166,683
Impairment and closure charges	132,620	1,487	2,107
Interest expense, net	66,895	60,393	61,686
Amortization of intangible assets	10,903	11,702	10,105
Loss on extinguishment of debt	0	8,276	0
Debt refinancing costs	0	0	2,523
Loss (gain) on disposition of assets	2,069	(332)	(625)
(Loss) income before income tax benefit (provision)	(108,562)	138,473	110,608
Income tax benefit (provision)	4,568	(34,127)	(30,254)
Net (loss) income	(103,994)	104,346	80,354
Other comprehensive (loss) income, net of tax:
Adjustment to unrealized loss on available-for-sale investments	0	0	50
Foreign currency translation adjustment	3	2	(5)
Total comprehensive (loss) income	(103,991)	104,348	80,399
Net (loss) income available to common stockholders:
Net (loss) income	(103,994)	104,346	80,354
Less: Net income allocated to unvested participating restricted stock	(420)	(3,532)	(2,711)
Net (loss) income available to common stockholders	$ (104,414)	$ 100,814	$ 77,643
Net (loss) income available to common stockholders per share:
Basic (in dollars per share)	$ (6.43)	$ 5.95	$ 4.43
Diluted (in dollars per share)	$ (6.43)	$ 5.85	$ 4.37
Weighted average shares outstanding:
Basic (in shares)	16,230	16,934	17,533
Diluted (in shares)	16,230	17,245	17,789
Franchisor
Revenues:
Revenue from contract with customer, excluding assessed tax	$ 469,453	$ 651,186	$ 643,934
Franchisor - Royalties, franchise fees, and other
Revenues:
Revenue from contract with customer, excluding assessed tax	267,959	368,171	375,640
Franchisor - Advertising Revenue
Revenues:
Revenue from contract with customer, excluding assessed tax	201,494	283,015	268,294
Company restaurant sales
Revenues:
Revenue from contract with customer, excluding assessed tax	108,054	131,214	7,084
Financing revenues
Revenues:
Revenue from contract with customer, excluding assessed tax	5,822	7,112	7,979
Advertising expenses
Revenues:
Revenue from contract with customer, excluding assessed tax	201,494	283,015	268,294
Cost of revenues:
Total franchise expenses	202,012	281,781	269,590
Bad debt expense (credit)
Cost of revenues:
Total franchise expenses	12,756	(365)	452
Other franchise expenses
Cost of revenues:
Total franchise expenses	$ 24,204	$ 31,338	$ 60,577