Supplemental Information to Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Dividends Payable [Line Items]
Interest paid, net of capitalized interest	$ 9,078	$ 8,618
Interest capitalized	492	193
Income taxes paid	6	471
Distributions payable on shares/units	32,367		$ 29,869
Issuance of common shares for Board of Trustees compensation	606	372
Accrued additions and improvements to hotel properties	378	576
Common Shares [Member]
Dividends Payable [Line Items]
Distributions payable on shares/units	29,175	23,685
Preferred Shares [Member]
Dividends Payable [Line Items]
Distributions payable on shares/units	$ 3,192	$ 5,550