Revenue From Contracts With Customers - Disaggregation by Booking Source (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total room revenues	$ 351,076	$ 350,866	$ 985,344	$ 980,220
Room revenues
Disaggregation of Revenue [Line Items]
Total room revenues	340,917	$ 345,089	958,075	$ 963,505
Other Hotel Revenues
Disaggregation of Revenue [Line Items]
Total room revenues	5,900		16,700
Property direct | Room revenues
Disaggregation of Revenue [Line Items]
Total room revenues	94,356		281,222
Central call center | Room revenues
Disaggregation of Revenue [Line Items]
Total room revenues	85,088		232,754
Proprietary website | Room revenues
Disaggregation of Revenue [Line Items]
Total room revenues	61,930		169,531
Third-party intermediaries | Room revenues
Disaggregation of Revenue [Line Items]
Total room revenues	65,338		178,339
Travel agency global distribution systems | Room revenues
Disaggregation of Revenue [Line Items]
Total room revenues	$ 34,205		$ 96,229