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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 15, 2017, the Board of Trustees granted awards of an aggregate of 58,539 service condition restricted common shares and 81,939 target performance-based equity to executive officers and employees of the Company. These awards will vest over 3 years. The actual number of common shares to be issued under the performance-based equity awards will be determined in early 2020 and will be based on certain performance criteria stipulated in the agreements for the period January 1, 2017 through December 31, 2019.