Supplemental Information to Statements of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Dividends Payable [Line Items]
Interest paid, net of capitalized interest	$ 28,011	$ 19,792
Interest capitalized	193	0
Income taxes paid	2,444	2,008
Distributions payable on shares/units	29,836		$ 23,293
Issuance of common shares for Board of Trustees compensation	372	421
Mortgage loans assumed in connection with acquisition	0	50,725
Below (above) market rate contracts assumed in connection with acquisition	20,110	1,826
Capital lease obligation assumed in connection with acquisition	0	10,758
Accrued additions and improvements to hotel properties	3,370	2,086
Write-off of fully depreciated furniture, fixtures and equipment	3,550	0
Write-off of deferred financing costs	321	0
Common Shares [Member]
Dividends Payable [Line Items]
Distributions payable on shares/units	24,286	16,609
Preferred Shares [Member]
Dividends Payable [Line Items]
Distributions payable on shares/units	$ 5,550	$ 5,550