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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 11, 2018, we announced that our Board of Trustees declared a dividend of $0.40625 per series D preferred share, which will be paid on May 15, 2018 to shareholders of record on April 27, 2018 (see Note 6). On May 4, 2018, we redeemed at par the total $400.0 million outstanding under our 5-year and 7-year term loans.