Segments (Schedule of Segment Reporting Information by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Rental revenues	$ 30,711	$ 30,841
Total revenues	237,182	188,163
Interest expense	18,400	17,600
Depreciation and amortization	10,179	7,940
Segment profit	41,132	22,711
Corporate
Segment Reporting Information [Line Items]
Interest expense	15,400	15,200
Depreciation and amortization	2,800	2,300
Operating Segments
Segment Reporting Information [Line Items]
Segment profit	102,600	83,500
Operating Segments \| Franchise operations
Segment Reporting Information [Line Items]
Depreciation and amortization	2,600	2,700
Segment profit	88,600	73,400
Operating Segments \| Rental operations
Segment Reporting Information [Line Items]
Rental revenues	30,700	30,900
Interest expense	2,500	2,400
Depreciation and amortization	3,500	2,900
Segment profit	8,100	8,200
Operating Segments \| Company restaurants
Segment Reporting Information [Line Items]
Interest expense	500	0
Depreciation and amortization	1,300	0
Segment profit	4,200	0
Operating Segments \| Financing operations
Segment Reporting Information [Line Items]
Segment profit	1,700	1,900
Corporate and unallocated expenses, net
Segment Reporting Information [Line Items]
Segment profit	(61,500)	(60,800)
Franchise revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed Tax	168,926	155,313
Franchise revenues \| Operating Segments \| Franchise operations
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed Tax	168,900	155,300
Company restaurant sales
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed Tax	35,735	0
Company restaurant sales \| Operating Segments \| Company restaurants
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed Tax	35,800	0
Financing revenues
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed Tax	1,810	2,009
Financing revenues \| Operating Segments \| Financing operations
Segment Reporting Information [Line Items]
Revenue from contract with customer, excluding assessed Tax	$ 1,800	$ 2,000

Rental income includes revenue from operating leases and interest income from direct financing leases.

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