Stockholders' Equity Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period			$ 573,203	$ 527,736
Comprehensive income	$ 25,551	$ 4,663	39,783	29,490
Cash dividends			(40,645)	(34,447)
Repurchases of common stock			(85,194)	(52,501)
Share-based compensation			9,591	11,372
Exercises of stock options			6,814	6,161
Vesting of restricted shares			(2,921)	(2,732)
Cumulative Effect of New Accounting Principle in Period of Adoption	(70,210)	1,880	(70,210)	1,880
Other			118	90
Balance at end of period	430,539	$ 487,049	430,539	$ 487,049
Deferred franchise fees	(93,139)		(93,139)		$ (10,881)
Deferred income taxes	(274,344)		(274,344)		(299,053)
Advertising funds restricted liabilities	(96,972)		(96,972)		$ (62,602)
Revenue recognition guidance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	(70,210)		(70,210)
Deferred franchise fees	(85,561)		(85,561)
Deferred income taxes	21,996		21,996
Advertising funds restricted liabilities	$ (6,645)		$ (6,645)