Management Agreements and Leases - Other, Net Lease Portfolio and TA Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) ft² property travelCenter brand tenant agreement industry	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) ft²	Dec. 01, 2020 hotel
Management Agreements and Leases [Line Items]
Cash provided by (used in) operating activities	$ (11,983)	$ (62,724)
Number of operating agreements | agreement	6
Rental income	$ 96,358	92,217
Adjustments necessary to record rent on straight line basis	1,973	1,883
COVID-19
Management Agreements and Leases [Line Items]
Reserves for uncollectible amounts against rental income	507	4,785
Reserves for uncollectible rents	11,420		$ 15,519
Amount of deferred annual minimum rents	$ 6,355
Number of rent deferral agreements | tenant	6
Temporary rent assistance as a percentage of total rental income	6.60%
SMTA Transaction
Management Agreements and Leases [Line Items]
Rental income	$ 34,320	29,644
Adjustments necessary to record rent on straight line basis	$ 1,371	1,422
Net Lease
Management Agreements and Leases [Line Items]
Number of properties owned | property	786
Number of tenants | tenant	174
Net Lease | TravelCenters of America Inc.
Management Agreements and Leases [Line Items]
Number of properties owned | travelCenter	179
Travel Centers of America
Management Agreements and Leases [Line Items]
Deferred percentage rental income	$ 2,391	1,386
Hotels | IHG Agreement
Management Agreements and Leases [Line Items]
Cash provided by (used in) operating activities	$ 130	(1,502)
Hotels | IHG Agreement | Ravinia, GA
Management Agreements and Leases [Line Items]
Number of properties owned | hotel				1
Hotels and net lease properties
Management Agreements and Leases [Line Items]
Square feet | ft²	13,515,100
Net Lease
Management Agreements and Leases [Line Items]
Square feet | ft²			154,206
Operating agreement annual rent and return	$ 372,023
Weighted average remaining lease term	10 years
Percentage of portfolio leased by tenants	97.60%
Number of brands | brand	133
Number of industries | industry	21
Net Lease | Real Estate Investment Property At Cost | Credit Concentration Risk | Travel Centers of America
Management Agreements and Leases [Line Items]
Percentage of total annual minimum rents	27.50%
Travel centers | Travel Centers of America
Management Agreements and Leases [Line Items]
Operating agreement annual rent and return	$ 246,110
Quarterly payments to deferred rent receivable	4,404	4,404
Remaining balance of previously deferred rents	17,614		$ 22,018
Rental income	62,038	62,077
Adjustments necessary to record rent on straight line basis	3,344	$ 3,305
Accruals for unpaid rent, including deferred rent	$ 40,606		$ 48,168
Increase in annual rent fixed interest rate	8.50%
Travel centers | Travel Centers of America | TA agreements
Management Agreements and Leases [Line Items]
Number of operating agreements | agreement	5