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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 9, 2012, we issued $300 million of 3.38% senior unsecured notes maturing in 2022. The notes were issued at 99.62% of the principal amount with a yield to maturity of 3.42%. The net proceeds received of $296.9 million were used to reduce amounts outstanding under our $500 million unsecured revolving credit facility and will be used to repay our $54.1 million of 3.95% convertible senior unsecured notes on November 8, 2012. On October 22, 2012, we called our 6.95% Series E Cumulative Redeemable Preferred Shares with a redemption value of $72.5 million which will settle on November 21, 2012. *****