Hotel Management Agreements and Leases - Sonesta (Details) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) hotel	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)
Management Agreements and Leases [Line Items]
Hotel managers’ deposits in restricted cash	$ 14,921	$ 15,602
Capital improvements from leased facilities, funded	26,483	32,731
Hotel | Sonesta agreements
Management Agreements and Leases [Line Items]
Operating agreement annual rent and return	110,379
Realized returns and rents	11,972	10,662
Related party transaction, management marketing and reservation system fees	7,325	5,729
Procurement and construction supervision fees	405	81
Capital improvements from leased facilities, funded	13,132
Increase in annual minimum returns	$ 747
Percentage increase in minimum returns	8.00%
Forecast | Hotel | Sonesta agreements
Management Agreements and Leases [Line Items]
Capital improvements from leased facilities, funded			$ 75,300	$ 76,600
Sonesta Int'l Hotels Corp | Hotel
Management Agreements and Leases [Line Items]
Due to related party, reimbursement of capital expenditures and other	$ 5,419	$ 783
Sonesta Int'l Hotels Corp | Full service hotel | Hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	10
Sonesta Int'l Hotels Corp | Limited services hotel | Hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	39