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Common Shares Of Beneficial Interest	12 Months Ended
Common Shares Of Beneficial Interest	Dec. 31, 2014
Class of Stock Disclosures [Abstract]
Common Shares Of Beneficial Interest	Common Shares of Beneficial Interest Common dividends declared per share were $1.55, $1.22 and $1.16 for the year ended December 31, 2014, 2013 and 2012, respectively. The regular dividend rate per share for our common shares for each quarter of 2014 and 2013 was $.325 and $.305, respectively. Also in December 2014, we paid a special dividend for our common shares in the amount of $.25 per share, which was due to the significant gains on dispositions of property. Subsequent to December 31, 2014, our Board of Trust Managers approved an increase to our 2015 first quarter dividend to $.345 per share.