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Consolidated Statements of Beneficiaries' Equity (USD $) In Thousands, except Share data | Total | Series E Preferred Stock [Member] | Common Stock [Member] | Deferred Compensation, Share-based Payments [Member] | Additional Paid-in Capital [Member] | Common Stock In Grantor Trust [Member] | Cumulative Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Cumulative Distributions [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ 1,889,696 | $ 43 | $ 1,424 | $ 5,631 | $ 2,776,197 | $ (5,631) | $ 477,338 | $ (6,079) | $ (1,392,332) | $ 33,105
Beginning Balance, shares at Dec. 31, 2011 |  | 4,300,000 | 142,690,755 | 292,646 |  |  |  |  |  |
Net income (loss) | 9,336 |  |  |  |  |  | 9,202 |  |  | 134
Comprehensive Income (Loss) | 75 |  |  |  |  |  |  | 74 |  | 1
Conversion of LP Units to Common Shares, shares |  |  | 20,464 |  |  |  |  |  |  |
Conversion of LP Units to Common Shares | (235) |  |  |  | 149 |  | (49) |  |  | (335)
Bonus Share Issuance, Shares |  |  | 35,703 |  |  |  |  |  |  |
Bonus Share Issuance | 387 |  |  |  | 387 |  |  |  |  |
Vesting of Restricted Shares, Shares |  |  | 30,820 | 9,036 |  |  |  |  |  |
Vesting of Restricted Shares | (89) |  | 1 |  | (90) |  |  |  |  |
Restricted Share Amortization | 678 |  |  |  | 678 |  |  |  |  |
Vesting of Restricted Performance Units, Shares |  |  | 249,797 |  |  |  |  |  |  |
Vesting of Restricted Performance Units | (1,328) |  | 3 |  | (1,331) |  |  |  |  |
Restricted Performance Units Amortization | 479 |  |  |  | 479 |  |  |  |  |
Stock Option Amortization | 376 |  |  |  | 376 |  |  |  |  |
Share Issuance from/to Deferred Compensation Plan, Shares |  |  | (5,389) | (8,560) |  |  |  |  |  |
Share Issuance from/to Deferred Compensation Plan | 0 |  |  | (195) |  | 195 |  |  |  |
Adjustments to Non-controlling Interest | 13 |  |  |  | 303 |  |  |  |  | (290)
Preferred Share distributions | (1,998) |  |  |  |  |  |  |  | (1,998) |
Distributions declared ($0.15 per share) | (21,948) |  |  |  |  |  |  |  | (21,586) | (362)
Ending Balance at Mar. 31, 2012 | 1,875,442 | 43 | 1,428 | 5,436 | 2,777,148 | (5,436) | 486,491 | (6,005) | (1,415,916) | 32,253
Ending Balance, shares at Mar. 31, 2012 |  | 4,300,000 | 143,022,150 | 293,122 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2012 | 1,773,516 | 40 | 1,434 | 5,352 | 2,780,194 | (5,352) | 479,734 | (15,918) | (1,493,206) | 21,238
Beginning Balance, shares at Dec. 31, 2012 |  | 4,000,000 | 143,538,733 | 290,745 |  |  |  |  |  |
Net income (loss) | 3,919 |  |  |  |  |  | 3,891 |  |  | 28
Comprehensive Income (Loss) | 1,893 |  |  |  |  |  |  | 1,870 |  | 23
Equity Issuance Costs | (61) |  |  |  | (61) |  |  |  |  |
Bonus Share Issuance, Shares |  |  | 27,918 |  |  |  |  |  |  |
Bonus Share Issuance | 361 |  |  |  | 361 |  |  |  |  |
Vesting of Restricted Shares, Shares |  |  | 21,116 | 7,050 |  |  |  |  |  |
Vesting of Restricted Shares | (84) |  |  |  | (84) |  |  |  |  |
Restricted Share Amortization | 849 |  |  |  | 849 |  |  |  |  |
Vesting of Restricted Performance Units, Shares |  |  | 26,067 |  |  |  |  |  |  |
Vesting of Restricted Performance Units | (161) |  |  |  | (161) |  |  |  |  |
Restricted Performance Units Amortization | 1,119 |  |  |  | 1,119 |  |  |  |  |
Restricted Share Forfeitures | 10 |  |  |  |  |  | 10 |  |  |
Exercise of Stock Options, Shares | 76,340 |  | 76,340 |  |  |  |  |  |  |
Exercise of Stock Options | 672 |  | 1 |  | 671 |  |  |  |  |
Stock Option Amortization | 261 |  |  |  | 261 |  |  |  |  |
Share Issuance from/to Deferred Compensation Plan, Shares |  |  | 22,404 | 17,958 |  |  |  |  |  |
Share Issuance from/to Deferred Compensation Plan | 0 |  |  | 164 |  | (164) |  |  |  |
Adjustments to Non-controlling Interest | 0 |  |  |  | (19) |  |  |  |  | 19
Preferred Share distributions | (1,725) |  |  |  |  |  |  |  | (1,725) |
Distributions declared ($0.15 per share) | (21,936) |  |  |  |  |  |  |  | (21,660) | (276)
Ending Balance at Mar. 31, 2013 | $ 1,758,633 | $ 40 | $ 1,435 | $ 5,516 | $ 2,783,130 | $ (5,516) | $ 483,635 | $ (14,048) | $ (1,516,591) | $ 21,032
Ending Balance, shares at Mar. 31, 2013 |  | 4,000,000 | 143,712,578 | 315,753 |  |  |  |  |  |

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