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Condensed Consolidated Statements Of Equity And Perpetual Preferred Units (USD $) | Total | Common Shares Of Beneficial Interest | Additional Paid-In Capital | Distributions In Excess Of Net Income | Treasury Shares, At Cost | Accumulated Other Comprehensive Loss | Non-controlling Interests | Perpetual Preferred Units
--- | --- | --- | --- | --- | --- | --- | --- | ---
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 | 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
Beginning Balance at Dec. 31, 2012 | 2,626,708,000 | 962,000 | 3,587,505,000 | (598,951,000) | (425,355,000) | (1,062,000) | 63,609,000 |
Net income | 139,370,000 |  |  | 135,648,000 |  |  | 3,722,000 |
Other comprehensive income | 27,000 |  |  |  |  | 27,000 |  |
Common shares issued | 40,182,000 | 6,000 | 40,176,000 |  |  |  |  |
Net share awards | 9,232,000 | (1,000) | (3,320,000) |  | 12,553,000 |  |  |
Employee stock purchase plan | 367,000 |  | 187,000 |  | 180,000 |  |  |
Common share options exercised | 2,621,000 |  | 664,000 |  | 1,957,000 |  |  |
Conversions of operating partnership units | 0 |  | 71,000 |  |  |  | (71,000) |
Cash distributions declared to equity holders | (113,377,000) |  |  | (110,983,000) |  |  | (2,394,000) |
Redemption of perpetual preferred units | 0 |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2013 | $ 2,705,130,000 | $ 967,000 | $ 3,625,283,000 | $ (574,286,000) | $ (410,665,000) | $ (1,035,000) | $ 64,866,000 |

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