Summary Of Refranchisings, Franchisee Development And Acquisitions (Number Of Restaurants Sold And Developed By Franchisees And Related Gains And Fees Recognized) (Details) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2018 USD ($)	Jul. 08, 2018 USD ($) restaurant	Jul. 09, 2017 USD ($) restaurant	Jul. 08, 2018 USD ($) restaurant	Jul. 09, 2017 USD ($) restaurant	Apr. 16, 2017 restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Restaurants sold to franchisees | restaurant			42	58	127	118
New restaurants opened by franchisees | restaurant			0	2	8	15
Initial franchise fees			$ 1,698	$ 2,292	$ 5,428	$ 5,120
Proceeds from Divestiture of Businesses	[1]		6,822	31,534	23,666	62,923
Total Proceeds from the Sale of Company-Operated Restaurants			39,864	31,534	88,214	62,923
Net assets sold (primarily property and equipment)			(6,745)	(9,532)	(19,891)	(19,838)
Operating Leases, Rent Expense, Sublease Rentals	[2]		0	(3,203)	(863)	(10,854)
Goodwill related to the sale of company-operated restaurants			(566)	(4,453)	(4,526)	(4,795)
Disposal Group Not Discontinued Operation Other Gain Loss On Disposal	[3]		(3,877)	(1,096)	(19,846)	(6,270)
Gains on the sale of company-operated restaurants			28,676	13,250	43,088	21,166
Additional proceeds from the sale of a company-operated restaurant					1,300	100
Proceeds from Sale and Collection of Notes Receivable			$ 24,300		33,400
Disposal Group Not Discontinued Operation Other Gain Loss On Disposal related to PY					$ 8,800	3,200
Impairment of Long-Lived Assets to be Disposed of						1,400
Number of restaurants | restaurant			2,241		2,241		2,255
Disposal Group, Held-for-sale, Not Discontinued Operations | Equipment
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Number of restaurants | restaurant			8		8
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Equipment
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Assets held for sale and leaseback			$ 1,000		$ 1,000
Forecast | Minimum
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Proceeds from sale of franchisees		$ 6,000
Forecast | Maximum
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Proceeds from sale of franchisees		$ 8,000
Remodel Credit
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Disposal Group Not Discontinued Operation Other Gain Loss On Disposal			2,900		8,100
Notes Receivable [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested	[4]		$ 33,042	$ 0	$ 64,548	$ 0

[1] (1)Year-to-date, amounts in 2018 and 2017 include additional proceeds of $1.3 million and $0.1 million, respectively, related to restaurants sold in prior years. During the quarter in 2018, an immaterial amount of additional proceeds was recognized, and none were recognized during the 2017 quarter.

[2] (3)Charges are for operating restaurant leases with lease commitments in excess of our sublease rental income from franchisees.

[3] (4)Amounts in year-to-date 2018 include an $8.8 million reduction of gains related to the modification of certain 2017 refranchising transactions. The quarter and year-to-date amounts in 2018 also include $2.9 million and $8.1 million, respectively, of costs related to franchise remodel incentives. Amounts in 2017 primarily represent impairment of $3.2 million and equipment write-offs of $1.4 million related to restaurants closed in connection with the sale of the related markets. In the 2017 quarter, amounts primarily represented maintenance and repair charges related to the sales.

[4] (2)During the quarter and year-to-date we collected payments of $24.3 million and $33.4 million, respectively, related to notes due from franchisees in connection with refranchising transactions.