Subsequent Events (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended						0 Months Ended
	Dec. 31, 2014 room		Dec. 31, 2013		Dec. 31, 2012		Feb. 23, 2015 property
Subsequent Event [Line Items]
Number of hotel rooms owned	22,900
Granted (in shares)	4,347	[1]	5,357	[1]	8,530	[1]
Proceeds from divestiture of businesses	$ 137,829
Subsequent Event
Subsequent Event [Line Items]
Number of properties sold							20
Proceeds from divestiture of businesses							$ 230,300
Restricted share awards
Subsequent Event [Line Items]
Granted (in shares)	348,234	[1]	383,187	[1]	445,176	[1]

[1] For the years ended December 31, 2014, 2013 and 2012, respectively, includes 4,347, 5,357 and 8,530 unrestricted shares issued in lieu of cash compensation to non-employee trustees at a weighted average grant date fair value of $29.31, $23.20 and $18.75, respectively.