Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Rental revenues	$ 27,382	$ 23,707	$ 53,524	$ 52,716
Total revenues	233,619	109,712	437,818	316,596
Cost of revenues:
Franchise expenses	79,257	37,080	144,200	106,530
Company restaurant expenses	34,759	21,139	67,643	51,471
Interest expense from finance leases	893	1,137	1,855	2,347
Other rental expenses	19,718	20,106	39,714	41,429
Total rental expenses	20,611	21,243	41,569	43,776
Financing expenses	115	128	243	270
Total cost of revenues	134,742	79,590	253,655	202,047
Gross profit	98,877	30,122	184,163	114,549
General and administrative expenses	39,276	30,870	79,187	68,478
Interest expense, net	15,739	17,127	32,235	32,299
Impairment and closure charges	2,571	124,365	4,581	124,353
Amortization of intangible assets	2,663	2,755	5,351	5,581
(Gain) loss on disposition of assets	(30)	1,776	137	1,543
Income before income taxes	38,658	(146,771)	62,672	(117,705)
Income tax (provision) benefit	(9,296)	11,992	(7,707)	5,254
Net income (loss)	29,362	(134,779)	54,965	(112,451)
Other comprehensive income net of tax:
Foreign currency translation adjustment	(1)	0	(2)	0
Total comprehensive income (loss)	29,361	(134,779)	54,963	(112,451)
Net income (loss) available to common stockholders:
Net income (loss)	29,362	(134,779)	54,965	(112,451)
Less: Net income allocated to unvested participating restricted stock	(657)	0	(1,431)	(420)
Net income (loss) available to common stockholders	$ 28,705	$ (134,779)	$ 53,534	$ (112,871)
Net income (loss) available to common stockholders per share:
Basic (USD per share)	$ 1.70	$ (8.33)	$ 3.21	$ (6.96)
Diluted (USD per share)	$ 1.69	$ (8.33)	$ 3.19	$ (6.96)
Weighted average shares outstanding:
Basic (in shares)	16,886	16,177	16,673	16,215
Diluted (in shares)	16,977	16,177	16,802	16,215
Franchise revenues
Revenues:
Revenue from contract with customer	$ 166,954	$ 67,876	$ 307,930	$ 212,913
Royalties, franchise fees and other
Revenues:
Revenue from contract with customer	94,630	38,781	174,721	122,095
Advertising revenues
Revenues:
Revenue from contract with customer	72,324	29,095	133,209	90,818
Company restaurant sales
Revenues:
Revenue from contract with customer	38,194	16,774	74,143	48,074
Financing revenues
Revenues:
Revenue from contract with customer	1,089	1,355	2,221	2,893
Advertising fees
Revenues:
Revenue from contract with customer	72,324	29,095	133,209	90,818
Cost of revenues:
Franchise expenses	72,324	29,095	133,209	90,818
Bad debt (credit) expense
Cost of revenues:
Franchise expenses	(291)	5,053	(2,284)	5,571
Other franchise expenses
Cost of revenues:
Franchise expenses	$ 7,224	$ 2,932	$ 13,275	$ 10,141