Segments (Schedule of Segment Reporting Information by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Rental revenues	$ 30,124	$ 30,830	$ 60,589	$ 62,239
Financing revenues	2,088	2,439	4,219	4,768
Total revenues	155,199	160,258	311,373	323,782
Interest expense	18,500	18,500	36,700	37,000
Depreciation and amortization	7,700	7,500	15,422	15,554
Segment profit	39,745	39,738	63,970	80,843
Operating Segments
Segment Reporting Information [Line Items]
Segment profit	91,900	97,400	184,400	196,800
Operating Segments | Franchise Operations
Segment Reporting Information [Line Items]
Franchise revenues	119,600	122,500	239,100	247,500
Depreciation and amortization	2,700	2,600	5,400	5,200
Segment profit	82,400	87,500	165,200	176,800
Operating Segments | Rental Operations
Segment Reporting Information [Line Items]
Rental revenues	30,100	30,800	60,600	62,200
Interest expense	2,600	3,000	5,400	6,100
Depreciation and amortization	3,000	3,200	6,000	6,300
Segment profit	7,500	7,800	15,300	16,000
Operating Segments | Company Restaurants
Segment Reporting Information [Line Items]
Company restaurants	3,400	4,500	7,500	9,300
Interest expense	100	100	200	200
Depreciation and amortization	0	100	100	200
Segment profit	(100)	(200)	(300)	(600)
Operating Segments | Financing Operations
Segment Reporting Information [Line Items]
Financing revenues	2,100	2,500	4,200	4,800
Segment profit	2,100	2,300	4,200	4,600
Corporate
Segment Reporting Information [Line Items]
Interest expense	15,800	15,400	31,100	30,700
Depreciation and amortization	2,000	1,600	3,900	3,800
Segment profit	$ (52,200)	$ (57,700)	$ (120,400)	$ (116,000)