Hotel Management Agreements and Leases - Narrative and Marriott No. 1 (Details) $ in Thousands	3 Months Ended		6 Months Ended		18 Months Ended
	Jun. 30, 2017 USD ($) agreement hotel travelcenter lease_agreement	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) agreement hotel travelcenter lease_agreement	Jun. 30, 2016 USD ($)	Dec. 31, 2018 USD ($)
Management Agreements and Leases [Line Items]
Number of operating agreements | agreement	14		14
Capital improvements from leased facilities, funded | $			$ 62,204	$ 86,929
Hotel
Management Agreements and Leases [Line Items]
Number of properties owned | hotel	310		310
Number of operating agreements | lease_agreement	9		9
Number of properties leased to taxable REIT subsidiaries | hotel	307		307
Number of properties leased to third parties | hotel	3		3
Hotel | Marriott No. 1 agreement
Management Agreements and Leases [Line Items]
Number of properties owned | hotel	53		53
Operating agreement annual rent and return | $			$ 68,952
Additional returns realized | $	$ 3,204	$ 5,410	3,204	6,249
Capital improvements from leased facilities, funded | $			$ 3,157
Percentage increase In minimum returns after funding for capital improvements			10.00%
Travel centers
Management Agreements and Leases [Line Items]
Number of properties owned | travelcenter	199		199
Travel centers | TA agreements
Management Agreements and Leases [Line Items]
Number of properties owned | travelcenter	199		199
Number of operating agreements | agreement	5		5
Forecast | Hotel | Marriott No. 1 agreement
Management Agreements and Leases [Line Items]
Capital improvements from leased facilities, funded | $					$ 967
Minimum | Hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	1		1
Hotel management agreements and leases, renewal period			20 years
Minimum | Hotel | Marriott No. 1 agreement
Management Agreements and Leases [Line Items]
Realized returns and rents | $	$ 17,222	$ 17,108	$ 34,410	$ 34,201
Maximum | Hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	97		97
Hotel management agreements and leases, renewal period			60 years