Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Rental revenues	$ 30,127	$ 30,263	$ 91,292	$ 90,852
Total revenues	194,099	174,903	566,733	555,017
Cost of revenues:
Franchise expenses	78,341	70,033	243,157	209,721
Rental expenses	22,982	22,318	68,411	67,665
Financing expenses	150	449	449	449
Company restaurant expenses	0	17	0	7,807
Total cost of revenues	101,473	92,817	312,017	285,642
Gross profit	92,626	82,086	254,716	269,375
General and administrative expenses	40,753	38,030	121,423	125,701
Interest expense	15,430	15,353	46,110	46,496
Amortization of intangible assets	2,505	2,507	7,513	7,507
Debt refinancing costs	2,532	0	2,532	0
Closure and other impairment charges	217	888	119	3,806
Impairment of goodwill and intangible assets	0	531,634	0	531,634
Gain on disposition of assets	(58)	(35)	(1,535)	(6,387)
Income (loss) before income tax (provision) benefit	31,247	(506,291)	78,554	(439,382)
Income tax (provision) benefit	(7,660)	55,939	(25,181)	26,732
Net income (loss)	23,587	(450,352)	53,373	(412,650)
Other comprehensive income (loss) net of tax:
Adjustment to unrealized loss on available-for-sale investments	0	0	50	0
Foreign currency translation adjustment	0	(2)	(6)	(2)
Total comprehensive income (loss)	23,587	(450,354)	53,417	(412,652)
Net income (loss) available to common stockholders:
Net income (loss)	23,587	(450,352)	53,373	(412,650)
Less: Net income allocated to unvested participating restricted stock	(799)	8,469	(1,793)	6,863
Net income available to common stockholders - basic	$ 22,788	$ (441,883)	$ 51,580	$ (405,787)
Net income (loss) available to common stockholders per share:
Basic (USD per share)	$ 1.31	$ (24.91)	$ 2.94	$ (22.90)
Diluted (USD per share)	$ 1.29	$ (24.91)	$ 2.90	$ (22.90)
Weighted average shares outstanding:
Basic (in shares)	17,439	17,742	17,562	17,718
Diluted (in shares)	17,738	17,742	17,797	17,718
Dividends declared per common share (USD per share)	$ 0.63	$ 0.97	$ 1.89	$ 2.91
Dividends paid per common share (USD per share)	$ 0.63	$ 0.97	$ 2.23	$ 2.91
Franchisor [Member]
Revenues:
Revenue from contract with customer, excluding assessed Tax	$ 162,078	$ 142,579	$ 469,332	$ 450,367
Financial Service [Member]
Revenues:
Revenue from contract with customer, excluding assessed Tax	1,894	2,061	6,109	6,280
Food and Beverage [Member]
Revenues:
Revenue from contract with customer, excluding assessed Tax	$ 0	$ 0	$ 0	$ 7,518