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Shareholders' Equity/Partners' Capital	9 Months Ended
Shareholders' Equity/Partners' Capital	Sep. 30, 2018
Equity [Abstract]
Shareholders' Equity/Partners' Capital	Shareholders' Equity/Partners' Capital On January 4 and 11, 2018, we redeemed all of the outstanding 6.625% Series G and Series I cumulative redeemable preferred shares/units at their redemption price of $25.00 per share/unit, or $470,000,000 in the aggregate, plus accrued and unpaid dividends/distributions through the date of redemption, and expensed $14,486,000 of previously capitalized issuance costs.