Supplemental Information to Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Non Cash Investing and Financing Information [Line Items]
Interest paid, net of capitalized interest	$ 7,655	$ 7,464
Income taxes paid	0	79
Distributions payable on shares/units	31,344		$ 31,823
Issuance of common shares for Board of Trustees compensation	662	503
Accrued additions and improvements to hotel properties	1,286	4,525
Write-off of deferred financing costs	0	356
Common Shares [Member]
Non Cash Investing and Financing Information [Line Items]
Distributions payable on shares/units	27,902	28,274
Preferred Shares [Member]
Non Cash Investing and Financing Information [Line Items]
Distributions payable on shares/units	$ 3,442	$ 3,442