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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 Income (Loss) | Noncontrolling 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 | 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 |  |  |  |  |
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 |
Perpetual Preferred Units, Ending Balance at Mar. 31, 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 | 64,433,000 |  |  | 63,476,000 |  |  | 957,000 |
Other comprehensive income | 14,000 |  |  |  |  | 14,000 |  |
Common shares issued | 9,366,000 | 1,000 | 9,365,000 |  |  |  |  |
Net share awards | 4,741,000 |  | (7,198,000) |  | 11,939,000 |  |  |
Employee stock purchase plan | 354,000 |  | 174,000 |  | 180,000 |  |  |
Common share options exercised | 960,000 |  | 367,000 |  | 593,000 |  |  |
Conversions of operating partnership units | 0 |  | 47,000 |  |  |  | (47,000) |
Cash distributions declared to equity holders | (56,553,000) |  |  | (55,356,000) |  |  | (1,197,000) |
Redemption of perpetual preferred units | 0 |  |  |  |  |  |  |
Other | 0 | (1,000) | 1,000 |  |  |  |  |
Ending Balance at Mar. 31, 2013 | $ 2,650,023,000 | $ 962,000 | $ 3,590,261,000 | $ (590,831,000) | $ (412,643,000) | $ (1,048,000) | $ 63,322,000 |

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