Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Rental revenues	$ 29,066	$ 27,382	$ 57,873	$ 53,524
Total revenues	237,794	233,619	468,217	437,818
Cost of revenues:
Franchise expenses	82,269	79,257	160,301	144,200
Bad debt credit	(147)	(291)	(446)	(2,284)
Company restaurant expenses	37,881	34,759	75,289	67,643
Interest expense from finance leases	746	893	1,514	1,855
Other rental expenses	21,097	19,718	42,452	39,714
Total rental expenses	21,843	20,611	43,966	41,569
Financing expenses	106	115	213	243
Total cost of revenues	142,099	134,742	279,769	253,655
Gross profit	95,695	98,877	188,448	184,163
General and administrative expenses	44,063	39,276	85,611	79,187
Interest expense, net	15,359	15,739	30,892	32,235
Closure and impairment charges			1,457	4,581
Amortization of intangible assets	2,665	2,663	5,330	5,351
(Gain) loss on disposition of assets	(234)	(30)	(1,530)	137
Income before income taxes	32,531	38,658	66,688	62,672
Income tax provision	(8,569)	(9,296)	(17,876)	(7,707)
Net income	23,962	29,362	48,812	54,965
Other comprehensive income, net of tax:
Foreign currency translation adjustment	(3)	(1)	(4)	(2)
Total comprehensive income	23,959	29,361	48,808	54,963
Net income available to common stockholders:
Net income	23,962	29,362	48,812	54,965
Less: Net income allocated to unvested participating restricted stock	(673)	(657)	(1,273)	(1,431)
Net income available to common stockholders	$ 23,289	$ 28,705	$ 47,539	$ 53,534
Net income available to common stockholders per share:
Basic (USD per share)	$ 1.45	$ 1.70	$ 2.90	$ 3.21
Diluted (USD per share)	$ 1.45	$ 1.69	$ 2.90	$ 3.19
Weighted average shares outstanding:
Basic (in shares)	16,050	16,886	16,386	16,673
Diluted (in shares)	16,080	16,977	16,418	16,802
Franchise Revenue:
Revenues:
Revenue from contract with customer	$ 168,259	$ 166,954	$ 329,491	$ 307,930
Royalties, franchise fees and other
Revenues:
Revenue from contract with customer	94,148	94,630	184,497	174,721
Advertising revenues
Revenues:
Revenue from contract with customer	74,111	72,324	144,994	133,209
Company restaurant sales
Revenues:
Revenue from contract with customer		38,194	78,927	74,143
Financing revenues
Revenues:
Revenue from contract with customer	958	1,089	1,926	2,221
Advertising fees
Revenues:
Revenue from contract with customer	74,111	72,324	144,994	133,209
Cost of revenues:
Franchise expenses	74,111	72,324	144,994	133,209
Other franchise expenses
Cost of revenues:
Franchise expenses	$ 8,305	$ 7,224	$ 15,753	$ 13,275