Acquisition and Disposition of Hotel Properties (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 23, 2017	Jun. 20, 2017
Real Estate Properties [Line Items]
Impairment loss	$ 6,003	$ 12,148	$ 0
Gain on sale of hotel properties	14,877	40,690	0
Operating income from disposed properties	4,200	$ 7,500	$ 5,600
Dumont NYC [Member]
Real Estate Properties [Line Items]
Consideration received for asset sold					$ 118,000
Impairment loss	1,000
Parking garage at Revere Boston Hotel [Member]
Real Estate Properties [Line Items]
Consideration received for asset sold				$ 95,000
Gain on sale of hotel properties	$ 13,900