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Preferred Shares Of Beneficial Interest	3 Months Ended
Preferred Shares Of Beneficial Interest	Mar. 31, 2013
Class of Stock Disclosures [Abstract]
Preferred Shares Of Beneficial Interest	Preferred Shares of Beneficial Interest In April 2003, we issued $75 million of depositary shares with each share representing one-thirtieth of a Series D Cumulative Redeemable Preferred Share. The depositary shares were redeemed on March 18, 2013, at our option, for cash at a redemption price of $25 per depositary share or $75 million, plus accrued and unpaid dividends thereon. Upon the redemption of these shares, the related original issuance costs of $2.2 million were reported as a deduction in arriving at net income attributable to common shareholders. The Series D Preferred Shares paid a 6.75% annual dividend, had a liquidation value of $750 per share and were not convertible or exchangeable for any of our property or securities. On May 6, 2013, we called a portion of our 6.5% Series F Cumulative Redeemable Preferred Shares with a redemption value of $200 million, which will settle on June 5, 2013.