Condensed Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 15, 2018 USD ($) restaurant	Sep. 29, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 29, 2019 USD ($)	Sep. 30, 2018 USD ($)
Consolidated Statements of Comprehensive Income (Unaudited)
Net Interest income (expense)		$ (4,249)	$ (6,058)	$ (14,797)	$ (16,930)
Income tax effects		421	(7,367)	2,535	4,651
Stores in Beijing and Tianjin, China
Consolidated Statements of Comprehensive Income (Unaudited)
Number of Restaurants Sold | restaurant	34
Other Comprehensive Income (Loss), Foreign Currency Transaction And Translation Reclassification Adjustment From AOCI	$ 1,300
Reversal of deferred tax related to foreign currency translation on refranchised stores	$ 300
Qualifying as hedges | Interest rate swap | Amount reclassified from AOCL
Consolidated Statements of Comprehensive Income (Unaudited)
Net Interest income (expense)		161	(19)	849	(216)
Income tax effects		$ (37)	$ 4	$ (195)	$ 50