Management Agreements and Leases - Sonesta (Details) $ in Thousands			1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 01, 2021 hotel	Feb. 27, 2020 USD ($) hotel	Mar. 31, 2021 USD ($) hotel	Sep. 30, 2021 USD ($) hotel	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) hotel	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Management Agreements and Leases [Line Items]
Capital improvements from leased facilities, funded						$ 64,340	$ 54,603
Equity in earnings (losses) of an investee				$ 2,158	$ (1,369)	$ 50	(4,305)
Sonesta Int'l Hotels Corp
Management Agreements and Leases [Line Items]
Noncontrolling interest, ownership percentage				34.00%		34.00%
Sonesta Int'l Hotels Corp
Management Agreements and Leases [Line Items]
Capital contribution payment			$ 25,443
Sonesta
Management Agreements and Leases [Line Items]
Number of properties with transferred branding and management | hotel			5
Sonesta | Subsequent event
Management Agreements and Leases [Line Items]
Number of properties with transferred branding and management | hotel	1
Sonesta agreements
Management Agreements and Leases [Line Items]
Percentage of historical real estate investments				52.90%		52.90%
Percent of gross revenues from hotel operations placed in FF&E reserve		5.00%
Equity method investments, carrying value				$ 62,143		$ 62,143
Amount of cost basis exceeding book value		$ 8,000
Amortization period		31 years
Amortization of basis difference				65	65	195	151
Equity in earnings (losses) of an investee				2,158	(1,369)	(50)	(4,305)
Decrease in hotel operating expense				621	621	1,863	1,448
Unamortized balance				$ 38,068		$ 38,068
Hotel
Management Agreements and Leases [Line Items]
Number of properties owned | hotel				304		304
Hotel | Sonesta agreements
Management Agreements and Leases [Line Items]
Automatic renewal term						1 year
Percentage increase in minimum returns						8.00%
Annual minimum returns and rents						$ 510,226
Percent payment of hotel cash flows				80.00%		80.00%
Hotel net income (loss)				$ 40,728	(6,155)	$ 28,531
Realized returns and rents							(31,969)
Related party transaction, management marketing and reservation system fees				26,640	3,831	59,962	12,756
Procurement and construction supervision fees				184		1,571	1,087
Capital improvements from leased facilities, funded						76,035	48,119
Increase (decrease) in annual minimum returns and rents						6,083	3,622
Advanced working capital				$ 55,977		$ 55,977		$ 41,514
Hotel | Sonesta Legacy Management and Pooling Agreement
Management Agreements and Leases [Line Items]
Number of properties owned | hotel				53		53
Hotel | Sonesta Int'l Hotels Corp
Management Agreements and Leases [Line Items]
Number of properties owned | hotel				261		261
Due to related party, reimbursement of capital expenditures and other				$ 5,016	$ 26,096	$ 5,016	$ 26,096
Hotel | Sonesta Int'l Hotels Corp | Full service hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel		14		41		41
Hotel | Sonesta Int'l Hotels Corp | Limited services hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel		39		157		157
Hotel | Sonesta Int'l Hotels Corp | Select service hotels
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel				63		63