Segments (Schedule of Segment Reporting Information by Segment) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Rental revenues	$ 30,709,000	$ 30,731,000	$ 61,462,000	$ 61,734,000
Financing revenues	3,368,000	3,230,000	8,021,000	7,067,000
Total segment revenues	160,521,000	158,114,000	327,722,000	321,283,000
Interest expense	24,942,000	24,956,000	49,911,000	50,251,000
Depreciation and amortization	8,700,000	8,800,000	17,498,000	17,636,000
Income before income taxes	31,132,000	26,956,000	64,846,000	57,146,000
Corporate and Other
Segment Reporting Information [Line Items]
Interest expense	28,700,000	29,100,000	57,700,000	58,600,000
Franchise Operations
Segment Reporting Information [Line Items]
Franchise revenues	110,700,000	108,000,000	226,300,000	219,900,000
Depreciation and amortization	2,600,000	2,700,000	5,200,000	5,500,000
Income before income taxes	84,200,000	81,900,000	170,300,000	165,600,000
Company Restaurants
Segment Reporting Information [Line Items]
Company restaurant sale revenue	15,700,000	16,100,000	32,000,000	32,600,000
Interest expense	100,000	100,000	200,000	200,000
Depreciation and amortization	500,000	600,000	1,000,000	1,100,000
Income before income taxes	100,000	0	200,000	200,000
Rental Operations
Segment Reporting Information [Line Items]
Rental revenues	30,700,000	30,700,000	61,400,000	61,700,000
Interest expense	3,700,000	4,000,000	7,600,000	8,100,000
Depreciation and amortization	3,300,000	3,300,000	6,700,000	6,700,000
Income before income taxes	7,100,000	6,200,000	13,900,000	12,900,000
Financing Operations
Segment Reporting Information [Line Items]
Financing revenues	3,400,000	3,300,000	8,000,000	7,100,000
Income before income taxes	3,100,000	3,000,000	7,200,000	6,800,000
Corporate
Segment Reporting Information [Line Items]
Interest expense	24,900,000	25,000,000	49,900,000	50,300,000
Depreciation and amortization	2,300,000	2,200,000	4,600,000	4,300,000
Income before income taxes	$ (63,400,000)	$ (64,100,000)	$ (126,800,000)	$ (128,400,000)