Management Agreements and Leases - Sonesta (Details) $ in Thousands			3 Months Ended		9 Months Ended
	Feb. 27, 2020 USD ($) hotel	Feb. 26, 2020 USD ($)	Sep. 30, 2020 USD ($) hotel	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) hotel	Sep. 30, 2019 USD ($)	Oct. 01, 2020 hotel	Dec. 31, 2019 USD ($)
Management Agreements and Leases [Line Items]
Capital improvements from leased facilities, funded					$ 54,603	$ 71,024
Equity in earnings (losses) of an investee			$ (1,369)	$ 83	$ (4,305)	617
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			$ 43,073		$ 43,073
Amount of cost basis exceeding book value	$ 8,000
Amortization period	31 years
Amortization of basis difference			65		151
Equity in earnings (losses) of an investee			(1,369)		(4,305)
Decrease in hotel operating expense			621		1,448
Unamortized balance			$ 40,552		40,552
Hotel
Management Agreements and Leases [Line Items]
Operating agreement annual rent and return					$ 38,901
Number of properties owned | hotel			329		329
Hotel | Sonesta agreements
Management Agreements and Leases [Line Items]
Operating agreement annual rent and return					$ 124,795
Number of properties owned | hotel							4
Percentage increase in minimum returns					8.00%
Hotel net income (loss)			$ (6,155)		$ (31,969)
Realized returns and rents				15,629		57,794
Percent payment of hotel cash flows			80.00%		80.00%
Requested working capital advances			$ 6,836		$ 14,187
Related party transaction, management marketing and reservation system fees			3,831	9,313	12,756	28,016
Procurement and construction supervision fees			184	$ 928	1,087	1,914
Capital improvements from leased facilities, funded					48,119	67,495
Increase in annual minimum returns					3,622	$ 4,140
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			$ 3,564		$ 3,564			$ 15,537
Hotel | Sonesta Int'l Hotels Corp | IHG Agreement and Marriott Contracts
Management Agreements and Leases [Line Items]
Number of properties owned | hotel			200		200
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		16		16
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		40		40