Acquisition of Business Preliminary estimated fair values of the assets acquired and liabilities assumed (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 345,314	$ 343,862	$ 345,314
Applebee's Restaurants In North And South Carolina
Business Acquisition [Line Items]
Reacquired franchise rights	11,600	11,600	11,600
Measurement period adjustments, reacquired franchise rights		0
Equipment and fixtures	10,000	10,000	10,000
Measurement period adjustments, equipment and fixtures		0
Inventory	1,400	1,400	1,400
Measurement period adjustments, inventory		0
Deferred income taxes	0	1,500	0
Measurement period adjustments, deferred income taxes		1,500
Total identifiable assets acquired	23,000	24,500	23,000
Measurement period adjustments, total identifiable assets acquired		1,500
Above-market leaseholds, net	(6,500)	(6,500)	(6,500)
Measurement period adjustments, above-market leaseholds, net		0
Other liabilities	(1,000)	(1,000)	(1,000)
Measurement period adjustments, other liabilities		0
Net identifiable assets acquired	15,500	17,000	15,500
Measurement period adjustments, net identifiable assets acquired		1,500
Goodwill	6,100	4,600	6,100
Measurement period adjustments, goodwill		(1,500)
Consideration transferred	$ 21,600	21,600	$ 21,600
Measurement period adjustments, consideration transferred		$ 0