Franchise Rights (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Finite-Lived Intangible Assets [Line Items]
Franchise agreement, term			20 years
Franchise RIghts Rollforward [Abstract]
Balance, beginning			$ 175,897
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 153,348		153,348
Amortization of intangible assets, franchise rights	(2,000)	$ (1,800)	(4,072)	$ (3,600)
Balance, end	325,173		325,173
Franchise Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets (excluding goodwill)	0	$ 0	0	$ 0
Franchise RIghts Rollforward [Abstract]
Amortization expense, expected for full fiscal period	8,300		8,300
Amortization expense, next twelve months	8,300		8,300
Second Fiscal Year	8,400		8,400
Third Fiscal Year	8,400		8,400
Fourth Fiscal Year	8,400		8,400
Fifth Fiscal Year	$ 8,400		$ 8,400