Supplemental Information to Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Dividends Payable [Line Items]
Interest paid, net of capitalized interest	$ 30,013	$ 28,011
Interest capitalized	492	193
Income taxes paid	369	2,444
Distributions payable on shares/units	33,058		$ 29,869
Issuance of common shares for Board of Trustees compensation	606	372
Below (above) market rate contracts assumed in connection with acquisition	0	20,110
Accrued additions and improvements to hotel properties	738	3,370
Write-off of fully depreciated furniture, fixtures and equipment	0	3,550
Write-off of deferred financing costs	550	321
Common Shares [Member]
Dividends Payable [Line Items]
Distributions payable on shares/units	29,616	24,286
Preferred Shares [Member]
Dividends Payable [Line Items]
Distributions payable on shares/units	$ 3,442	$ 5,550