Condensed Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) $ in Thousands		3 Months Ended		6 Months Ended
	Jun. 15, 2018 USD ($) restaurant	Jun. 30, 2019 USD ($)	Jul. 01, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jul. 01, 2018 USD ($)
Consolidated Statements of Comprehensive Income (Unaudited)
Net Interest income (expense)		$ (4,272)	$ (5,797)	$ (10,548)	$ (10,872)
Income tax effects		1,283	7,040	2,114	12,018
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)		231	(89)	688	197
Income tax effects		$ 53	$ 20	$ 158	$ 45