Management Agreements and Leases - Sonesta (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) hotel	Mar. 31, 2018 USD ($)
Management Agreements and Leases [Line Items]
Capital improvements from leased facilities, funded	$ 11,738	$ 26,483
Hotel | Sonesta agreements
Management Agreements and Leases [Line Items]
Percentage increase in minimum returns	8.00%
Operating agreement annual rent and return	$ 127,573
Realized returns and rents	14,161	11,972
Related party transaction, management marketing and reservation system fees	8,523	7,325
Procurement and construction supervision fees	405	405
Capital improvements from leased facilities, funded	10,467	13,132
Increase in annual minimum returns	484	747
Sonesta Int'l Hotels Corp | Hotel
Management Agreements and Leases [Line Items]
Due to related party, reimbursement of capital expenditures and other	$ 9,226	$ 5,419
Sonesta Int'l Hotels Corp | Hotel | Full service hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	12
Sonesta Int'l Hotels Corp | Hotel | Limited services hotel
Management Agreements and Leases [Line Items]
Number of real estate properties leased or managed | hotel	39