Hotel Management Agreements and Leases - InterContinental (Details) $ in Thousands	3 Months Ended		6 Months Ended		18 Months Ended
	Jun. 30, 2017 USD ($) hotel	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) hotel	Jun. 30, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)
Management Agreements and Leases [Line Items]
Security deposit balance	$ 120,757		$ 120,757			$ 89,338
Capital improvements from leased facilities, funded			62,204	$ 86,929
Hotel
Management Agreements and Leases [Line Items]
Amount by which the cash flow available to pay the entity's minimum rent or return was more than the minimum amount	$ 36,559	$ 43,440	$ 36,724	46,918
Number of properties acquired | hotel			4
InterContinental agreement | Hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	97		97
Operating agreement annual rent and return			$ 181,485
Additional returns realized	$ 3,261	3,575	3,572	3,904
Security deposit balance required to be maintained with entity	37,000		37,000
Replenishment (utilization) of security deposit			$ 5,861
Number of properties acquired | hotel			3
Supplement on existing security deposit			$ 19,696
Security deposit balance	$ 98,303		$ 98,303
Percentage increase in minimum returns			8.00%
Minimum | Hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	1		1
Minimum | InterContinental agreement | Hotel
Management Agreements and Leases [Line Items]
Realized returns and rents	$ 43,637	$ 40,084	$ 85,245	$ 78,288
Maximum | Hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	97		97
Maximum | InterContinental agreement | Hotel
Management Agreements and Leases [Line Items]
Amount by which the cash flow available to pay the entity's minimum rent or return was more than the minimum amount			$ 100,000
Forecast | InterContinental agreement | Hotel
Management Agreements and Leases [Line Items]
Capital improvements from leased facilities, funded					$ 12,751