Management Agreements and Leases - Narrative and Marriott No. 1 (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) travel_center agreement hotel property	Mar. 31, 2018 USD ($)	Feb. 22, 2019 hotel
Management Agreements and Leases [Line Items]
Number of operating agreements | agreement	13
Capital improvements from leased facilities, funded | $	$ 11,738	$ 26,483
Hotel
Management Agreements and Leases [Line Items]
Number of properties owned | hotel	327
Number of operating agreements | agreement	8
Number of properties leased to taxable REIT subsidiaries | hotel	325
Number of properties leased to third parties | hotel	2
Hotel | Marriott No. 1 agreement
Management Agreements and Leases [Line Items]
Number of properties owned | hotel	53
Operating agreement annual rent and return | $	$ 71,496
Realized returns and rents | $	15,712	16,083
Capital improvements from leased facilities, funded | $	13,593	177
Increase (decrease) in annual minimum returns and rents | $	$ 1,359	$ 18
Hotel | Minimum
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | property	1
Hotel management agreements and leases, renewal period	20 years
Hotel | Maximum
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	101		101
Hotel management agreements and leases, renewal period	60 years
Travel centers
Management Agreements and Leases [Line Items]
Number of properties owned | travel_center	179