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Condensed Consolidated Statements Of Equity And Perpetual Preferred Units (USD $) | Total | Common Shares Of Beneficial Interest [Member] | Additional Paid-In Capital [Member] | Distributions In Excess Of Net Income [Member] | Treasury Shares, At Cost [Member] | Accumulated Other Comprehensive Loss [Member] | Noncontrolling Interests [Member] | Perpetual Preferred Units [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Perpetual preferred units, Beginning Balance at Dec. 31, 2010 |  |  |  |  |  |  |  | $ 97,925,000
Beginning Balance at Dec. 31, 2010 | 1,757,373,000 | 824,000 | 2,775,625,000 | (595,317,000) | (461,255,000) | (33,458,000) | 70,954,000 |
Net income | 7,851,000 |  |  | 7,286,000 |  |  | 565,000 | 1,750,000
Other comprehensive income | 1,954,000 |  |  |  |  | 1,954,000 |  |
Common shares issued | 3,795,000 | 1,000 | 3,794,000 |  |  |  |  |
Net share awards | 3,551,000 | 4,000 | 3,547,000 |  |  |  |  |
Employee stock purchase plan | 821,000 |  | 33,000 |  | 788,000 |  |  |
Share awards placed into deferred plans | 0 | (2,000) | 2,000 |  |  |  |  |
Common share options exercised | 616,000 |  | 616,000 |  |  |  |  |
Conversions of operating partnership units | 0 |  | 4,000 |  |  |  | (4,000) |
Cash distributions declared to perpetual preferred units |  |  |  |  |  |  |  | (1,750,000)
Cash distributions declared to equity holders | (36,940,000) |  |  | (35,709,000) |  |  | (1,231,000) |
Redemption of perpetual preferred units | 0 |  |  |  |  |  |  |
Perpetual preferred units, Ending Balance at Mar. 31, 2011 |  |  |  |  |  |  |  | 97,925,000
Ending Balance at Mar. 31, 2011 | 1,739,021,000 | 827,000 | 2,783,621,000 | (623,740,000) | (460,467,000) | (31,504,000) | 70,284,000 |
Perpetual preferred units, Beginning Balance at Dec. 31, 2011 | 97,925,000 |  |  |  |  |  |  | 97,925,000
Beginning Balance at Dec. 31, 2011 | 1,827,768,000 | 845,000 | 2,901,024,000 | (690,466,000) | (452,003,000) | (683,000) | 69,051,000 |
Net income | 90,253,000 |  |  | 88,758,000 |  |  | 1,495,000 | 2,851,000
Other comprehensive income | 8,000 |  |  |  |  | 8,000 |  |
Common shares issued | 435,911,000 | 73,000 | 435,838,000 |  |  |  |  |
Net share awards | 4,119,000 |  | (9,110,000) |  | 13,229,000 |  |  |
Employee stock purchase plan | 318,000 |  | 148,000 |  | 170,000 |  |  |
Common share options exercised | 1,899,000 |  | 510,000 |  | 1,389,000 |  |  |
Conversions of operating partnership units | 0 | 2,000 | (450,000) |  |  |  | 448,000 |
Cash distributions declared to perpetual preferred units |  |  |  |  |  |  |  | (776,000)
Cash distributions declared to equity holders | (48,745,000) |  |  | (46,366,000) |  |  | (2,379,000) |
Redemption of perpetual preferred units | 100,000,000 |  |  |  |  |  |  | (100,000,000)
Other | 0 | (1,000) | 1,000 |  |  |  |  |
Perpetual preferred units, Ending Balance at Mar. 31, 2012 | 0 |  |  |  |  |  |  | 0
Ending Balance at Mar. 31, 2012 | $ 2,311,531,000 | $ 919,000 | $ 3,327,961,000 | $ (648,074,000) | $ (437,215,000) | $ (675,000) | $ 68,615,000 |

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