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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 12, 2018, we announced that our Board of Trustees declared a dividend of $0.40625 per series D preferred share, which will be paid on August 15, 2018 to shareholders of record on July 30, 2018 (see Note 6).