Supplemental Information to Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Non Cash Investing and Financing Information [Line Items]
Interest paid, net of capitalized interest	$ 17,871	$ 21,671
Interest capitalized	0	492
Income taxes paid	540	357
Distributions payable on shares/units	31,508		$ 33,215
Issuance of common shares for Board of Trustees compensation	503	606
Accrued additions and improvements to hotel properties	514	2,988
Write-off of deferred financing costs	776	550
Common Shares [Member]
Non Cash Investing and Financing Information [Line Items]
Distributions payable on shares/units	28,066	29,467
Preferred Shares [Member]
Non Cash Investing and Financing Information [Line Items]
Distributions payable on shares/units	$ 3,442	$ 3,701