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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 Income (Loss) [Member] | Noncontrolling Interests [Member] | Perpetual Preferred Units [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
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 |
Perpetual Preferred Units, Beginning Balance at Dec. 31, 2010 |  |  |  |  |  |  |  | 97,925,000
Net income (loss) | (7,954,000) |  |  | (9,311,000) |  |  | 1,357,000 | 3,500,000
Other comprehensive income | 33,551,000 |  |  |  |  | 33,551,000 |  |
Common shares issued | 37,126,000 | 6,000 | 37,120,000 |  |  |  |  |
Net share awards | 6,875,000 | 4,000 | 6,346,000 |  | 525,000 |  |  |
Employee stock purchase plan | 1,020,000 |  | 232,000 |  | 788,000 |  |  |
Common share options exercised | 4,583,000 | 1,000 | 3,774,000 |  | 808,000 |  |  |
Conversions of operating partnership units | 0 | 1,000 | 591,000 |  |  |  | (592,000) |
Cash distributions declared to perpetual preferred units |  |  |  |  |  |  |  | (3,500,000)
Cash distributions declared to equity holders | (74,186,000) |  |  | (71,739,000) |  |  | (2,447,000) |
Redemption of perpetual preferred units | 0 |  |  |  |  |  |  |
Other | 0 | (2,000) | 2,000 |  |  |  |  |
Ending Balance at Jun. 30, 2011 | 1,758,388,000 | 834,000 | 2,823,690,000 | (676,367,000) | (459,134,000) | 93,000 | 69,272,000 |
Perpetual Preferred Units, Ending Balance at Jun. 30, 2011 |  |  |  |  |  |  |  | 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 |
Perpetual Preferred Units, Beginning Balance at Dec. 31, 2011 |  |  |  |  |  |  |  | 97,925,000
Net income (loss) | 113,100,000 |  |  | 110,521,000 |  |  | 2,579,000 | 2,851,000
Other comprehensive income | 16,000 |  |  |  |  | 16,000 |  |
Common shares issued | 604,459,000 | 99,000 | 604,360,000 |  |  |  |  |
Net share awards | 7,839,000 |  | (6,182,000) |  | 14,021,000 |  |  |
Employee stock purchase plan | 464,000 |  | 294,000 |  | 170,000 |  |  |
Common share options exercised | 9,161,000 |  | 2,307,000 |  | 6,854,000 |  |  |
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 | (97,899,000) |  |  | (94,276,000) |  |  | (3,623,000) |
Redemption of perpetual preferred units | 100,000,000 |  |  |  |  |  |  | (100,000,000)
Other | 0 | (1,000) | 1,000 |  |  |  |  |
Ending Balance at Jun. 30, 2012 | 2,464,908,000 | 945,000 | 3,501,354,000 | (674,221,000) | (430,958,000) | (667,000) | 68,455,000 |
Perpetual Preferred Units, Ending Balance at Jun. 30, 2012 |  |  |  |  |  |  |  | $ 0

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