Management Agreements and Leases - Sonesta (Details) $ in Thousands			3 Months Ended		6 Months Ended
	Feb. 27, 2020 USD ($)	Feb. 26, 2020 USD ($)	Jun. 30, 2020 USD ($) hotel	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) hotel	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Management Agreements and Leases [Line Items]
Aggregate undepreciated carrying value of real estate			$ 11,298,816		$ 11,298,816
Capital improvements from leased facilities, funded					45,858	$ 37,189
Equity in earnings (losses) of an investee			$ (2,218)	$ 130	$ (2,936)	534
Sonesta Int'l Hotels Corp
Management Agreements and Leases [Line Items]
Noncontrolling interest, ownership percentage			34.00%		34.00%
Sonesta agreements
Management Agreements and Leases [Line Items]
Percent of gross revenues from hotel operations placed in escrow	5.00%
Equity method investments, carrying value			$ 44,378		$ 44,378
Amount of cost basis exceeding book value	$ 8,000
Amortization period	31 years
Amortization of basis difference			65		65
Equity in earnings (losses) of an investee			2,218		2,936
Decrease in hotel operating expense			621		828
Unamortized balance			41,172		41,172
Hotel
Management Agreements and Leases [Line Items]
Operating agreement annual rent and return					32,628
Hotel | Sonesta agreements
Management Agreements and Leases [Line Items]
Operating agreement annual rent and return					$ 119,779
Percentage increase in minimum returns					8.00%
Hotel net income (loss)			$ (17,666)		$ (25,814)
Realized returns and rents				28,005		42,165
Percent payment of hotel cash flows			80.00%		80.00%
Requested working capital advances			$ 7,351
Related party transaction, management marketing and reservation system fees			2,147	10,180	$ 8,925	18,703
Procurement and construction supervision fees			270	$ 581	902	986
Capital improvements from leased facilities, funded					40,088	34,306
Increase in annual minimum returns					2,934	$ 1,928
Hotel | Sonesta ES Suites
Management Agreements and Leases [Line Items]
Aggregate undepreciated carrying value of real estate			461,263		461,263
Hotel | Sonesta ES Suites | Sonesta agreements
Management Agreements and Leases [Line Items]
Operating agreement annual rent and return	$ 48,239
Hotel | Full service hotel | Sonesta agreements
Management Agreements and Leases [Line Items]
Operating agreement annual rent and return	$ 69,013	$ 99,013
Hotel | Sonesta Int'l Hotels Corp
Management Agreements and Leases [Line Items]
Due to related party, reimbursement of capital expenditures and other			$ 7,154		$ 7,154		$ 15,537
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		14
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		39