Reportable Segment Information Schedule Of Financial Information For Company's Franchising Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reportable Segment Information [Line Items]
Revenues	$ 291,490	$ 269,930	$ 796,325	$ 719,814
Operating income (loss)	111,168	93,063	266,433	225,005
Income (loss) before income taxes	102,443	83,743	232,928	194,436
Corporate & Other
Reportable Segment Information [Line Items]
Revenues	3,677	2,859	10,704	7,971
Operating income (loss)	(14,857)	(23,437)	(41,615)	(51,198)
Income (loss) before income taxes	(23,625)	(32,482)	(69,762)	(78,553)
Hotel Franchising | Operating Segments
Reportable Segment Information [Line Items]
Revenues	287,813	267,071	785,621	711,843
Operating income (loss)	126,025	116,500	308,048	276,203
Income (loss) before income taxes	$ 126,068	$ 116,225	$ 302,690	$ 272,989