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Consolidated Statements Of Equity And Perpetual Preferred Units (Parenthetical) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Common share options exercised | 504,838 | 141,213 | 18,521
Cash distributions per share | $ 1.96 | $ 1.80 | $ 2.05
Common Shares Of Beneficial Interest [Member] |  |  |
Common shares issued | 1,751,000 | 4,868,000 | 10,350,000
Conversions and redemptions of operating partnership units, shares | 66,000 | 279,000 | 139,000
Additional Paid-In Capital [Member] |  |  |
Common shares issued | 1,751,000 | 4,868,000 | 10,350,000
Common share options exercised | 68,000 | 41,000 | 19,000
Conversions and redemptions of operating partnership units, shares | 66,000 | 279,000 | 139,000
Distributions In Excess Of Net Income [Member] |  |  |
Cash distributions per share | $ 1.96 | $ 1.8 | $ 2.05
Treasury Shares, At Cost [Member] |  |  |
Common share options exercised | 68,000 |  |
Noncontrolling Interests [Member] |  |  |
Conversions and redemptions of operating partnership units, shares | 66,000 | 279,000 | 139,000
Cash distributions per share | $ 1.96 | $ 1.8 | $ 2.05

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