Organization and Basis of Presentation (Details) $ in Thousands	Sep. 30, 2021 USD ($) hotel property travelCenter tenant	Aug. 01, 2021 hotel	Jun. 07, 2021 hotel	Dec. 31, 2020 USD ($)	Sep. 30, 2020 hotel
Variable Interest Entity [Line Items]
Ownership interest in subsidiaries	100.00%
Assets of TRSs | $	$ 9,334,831			$ 8,687,319
Liabilities of TRSs | $	$ 7,581,089			6,584,529
Hotel
Variable Interest Entity [Line Items]
Number of properties owned	304
Net Lease Property
Variable Interest Entity [Line Items]
Number of properties owned | property	794
Number of tenants | tenant	175
Travel centers
Variable Interest Entity [Line Items]
Number of properties owned | travelCenter	179
Sonesta Int'l Hotels Corp | Hotel
Variable Interest Entity [Line Items]
Number of properties owned	261
Hyatt Hotels Corporation | Hotel
Variable Interest Entity [Line Items]
Number of properties owned	17		22
Radisson Agreement | Hotel
Variable Interest Entity [Line Items]
Number of properties owned	9	8
Marriott Contracts | Hotel
Variable Interest Entity [Line Items]
Number of properties owned	16				122
IHG Agreement | Hotel
Variable Interest Entity [Line Items]
Number of properties owned	1
Consolidated
Variable Interest Entity [Line Items]
Assets of TRSs | $	$ 151,506			118,862
Liabilities of TRSs | $	$ 39,169			$ 70,240