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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 | 144,903,000 |  |  | 141,224,000 |  |  | 3,679,000 | 2,851,000
Other comprehensive income | 23,000 |  |  |  |  | 23,000 |  |
Common shares issued | 693,375,000 | 112,000 | 693,263,000 |  |  |  |  |
Net share awards | 11,619,000 |  | (2,477,000) |  | 14,096,000 |  |  |
Employee stock purchase plan | 1,331,000 |  | 613,000 |  | 718,000 |  |  |
Common share options exercised | 13,273,000 |  | 1,840,000 |  | 11,433,000 |  |  |
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 | (148,943,000) |  |  | (142,993,000) |  |  | (5,950,000) |
Redemption of perpetual preferred units | (100,000,000) |  |  |  |  |  |  | (100,000,000)
Purchase of non-controlling interests | (10,241,000) |  | (13,285,000) |  |  |  | 3,044,000 |
Ending Balance at Sep. 30, 2012 | 2,533,108,000 | 959,000 | 3,580,528,000 | (692,235,000) | (425,756,000) | (660,000) | 70,272,000 |
Perpetual Preferred Units, Ending Balance at Sep. 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 | 211,172,000 |  |  | 206,368,000 |  |  | 4,804,000 |
Other comprehensive income | 41,000 |  |  |  |  | 41,000 |  |
Common shares issued | 40,098,000 | 6,000 | 40,092,000 |  |  |  |  |
Net share awards | 13,606,000 | (1,000) | 987,000 |  | 12,620,000 |  |  |
Employee stock purchase plan | 906,000 |  | 437,000 |  | 469,000 |  |  |
Common share options exercised | 2,697,000 |  | 740,000 |  | 1,957,000 |  |  |
Change in classification of deferred compensation plan | (34,517,000) |  | (34,517,000) |  |  |  |  |
Change in redemption of non-qualified share awards | (12,928,000) |  |  | (12,928,000) |  |  |  |
Diversification of share awards within deferred compensation plan | 353,000 |  | 221,000 | 132,000 |  |  |  |
Conversions of operating partnership units | 0 |  | 71,000 |  |  |  | (71,000) |
Cash distributions declared to equity holders | (170,146,000) |  |  | (166,556,000) |  |  | (3,590,000) |
Redemption of perpetual preferred units | 0 |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2013 | $ 2,677,990,000 | $ 967,000 | $ 3,595,536,000 | $ (571,935,000) | $ (410,309,000) | $ (1,021,000) | $ 64,752,000 |

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