Quarterly Data - Unaudited, in Thousands, except Per Share Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Total revenues	$ 417,514	$ 403,706	$ 399,623	$ 398,405	$ 397,566	$ 385,231	$ 429,952	$ 450,122	$ 1,619,248	$ 1,662,871	$ 1,783,359
Operating income (loss)	(132)	4,927	14,231	5,509	(7,326)	(14,170)	24,910	28,139	24,535	31,553	151,017
Net income (loss) attributable to the Company	$ (2,142)	$ 385	$ 8,354	$ (1,731)	$ (12,868)	$ (13,300)	$ 11,199	$ 17,443	$ 4,866	$ 2,474	$ 102,292
Basic (loss) earnings per common share	$ (0.18)	$ (0.10)	$ 0.15	$ (0.12)	$ (0.41)	$ (0.42)	$ 0.35	$ 0.52	$ (0.24)	$ 0.08	$ 2.86
Diluted (loss) earnings per common share	(0.18)	(0.10)	0.15	(0.12)	(0.41)	(0.42)	0.35	0.52	(0.24)	0.08	2.83
Dividends declared per common share	$ 0.225	$ 0.225	$ 0.225	$ 0.225	$ 0.225	$ 0.225	$ 0.225	$ 0.225	$ 0.90	$ 0.90	$ 0.85
After tax loss from Special charges	$ (19,800)	$ (11,000)	$ (4,200)	$ (13,500)	$ 19,700	$ 19,300
Unfavorable impact on diluted EPS from Special charges	$ 0.62	$ 0.35	$ 0.13	$ 0.43	$ 0.63	$ 0.61
After tax gain related to refranchising of restaurants	$ 2,200	$ 1,300			$ 1,300
After tax gain related to refranchising of restaurants (per share)	$ 0.07	$ 0.04			$ 0.04
China Operations
After tax loss from the sale of company-owned stores							$ 1,600
Impact on basic and diluted EPS from the sale of company-owned stores							$ 0.05
Tax increase related to refranchising of stores							$ 2,400
Unfavorable impact on basic and diluted EPS related to refranchising of stores							$ 0.07