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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 11, 2019, we announced that our Board of Trustees declared a dividend of $0.40625 per series D preferred share, which will be paid on February 15, 2019 to shareholders of record on January 30, 2019. On January 29, 2019, certain of our subsidiaries entered into a contract to sell 100% of the equity interests in the fee simple owner of our 1,286,936 square foot property at 1735 Market Street, for a sales price of $451.6 million, excluding credits and closing costs. This transaction is subject to customary closing extensions and conditions, and there is no certainty that this transaction will close.