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Consolidated Statements of Beneficiaries' Equity (USD $) In Thousands, except Share data | Total | Total Preferred Shares | Series C Preferred Stock [Member] | Series E Preferred Stock [Member] | Common Stock | Treasury Stock | Deferred Compensation Payable in Common Shares | Common Shares in Grantor Trust | Additional Paid-in Capital | Cumulative Earnings | Accumulated Other Comprehensive Income (Loss) | Cumulative Distributions | Non-Controlling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2010 | $ 1,977,774 | $ 43 |  |  | $ 1,343 | $ (3,074) | $ 5,774 | $ (5,774) | $ 2,671,217 | $ 483,439 | $ (1,945) | $ (1,301,521) | $ 128,272
Beginning Balance, shares at Dec. 31, 2010 |  | 4,300,000 |  |  | 134,601,796 | 116,679 | 291,281 |  |  |  |  |  |
Net income (loss) | (113) |  |  |  |  |  |  |  |  | (259) |  |  | 146
Comprehensive income (loss) | (487) |  |  |  |  |  |  |  |  |  | (479) |  | (8)
Issuance of Common Shares of Beneficial Interest | 8,272 |  |  |  | 7 |  |  |  | 8,265 |  |  |  |
Issuance of Common Shares of Beneficial Interest, shares |  |  |  |  | 679,285 |  |  |  |  |  |  |  |
Equity issuance costs | 338 |  |  |  |  |  |  |  | (308) |  |  |  | 30
Conversion of LP Units to Common Shares | 0 |  |  |  | 1 |  |  |  | 1,098 |  |  |  | (1,099)
Conversion of LP Units to Common Shares, shares |  |  |  |  | 92,992 |  |  |  |  |  |  |  |
Bonus Share Issuance | 6 |  |  |  |  | 12 | 6 | (6) |  | (6) |  |  |
Bonus Share Issuance, shares |  |  |  |  |  | (463) | 463 |  |  |  |  |  |
Vesting of Restricted Shares | (352) |  |  |  | 1 | 3,062 |  |  | (1,818) | (1,597) |  |  |
Vesting of Restricted Shares, shares |  |  |  |  | 85,248 | (116,216) | 9,043 |  |  |  |  |  |
Restricted Share Amortization | 2,228 |  |  |  |  |  |  |  | 2,228 |  |  |  |
Restricted Performance Units Amortization | 1,229 |  |  |  |  |  |  |  | 1,229 |  |  |  |
Exercise of Stock Options | 659 |  |  |  | 1 |  |  |  | 658 |  |  |  |
Exercise of Stock Options, shares |  |  |  |  | 120,179 |  |  |  |  |  |  |  |
Share Option Amortization | 1,105 |  |  |  |  |  |  |  | 1,105 |  |  |  |
Outperformance Plan Amortization | 128 |  |  |  |  |  |  |  | 128 |  |  |  |
Outperformance Plan Amortization, shares |  |  |  |  |  |  |  |  |  |  |  |  |
Share Issuance from/to Deferred Compensation Plan | (16) |  |  |  |  |  | (149) | 149 | (16) |  |  |  |
Share Issuance from/to Deferred Compensation Plan, shares |  |  |  |  | (845) |  | (8,141) |  |  |  |  |  |
Share Choice Plan Issuance Shares |  |  |  |  | (1,684) |  |  |  |  |  |  |  |
Share Choice Plan Issuance | (55) |  |  |  |  |  |  |  | (55) |  |  |  |
Stock Issued During Period, Value, Other | 32 |  |  |  |  |  |  |  | 32 |  |  |  |
Stock Issued During Period, Shares, Other |  |  |  |  | 2,672 |  |  |  |  |  |  |  |
Adjustment to Non-controlling Interest | 0 |  |  |  |  |  |  |  | 3,037 |  |  |  | (3,037)
Preferred Share distributions | (5,994) |  |  |  |  |  |  |  |  |  |  | (5,994) |
Preferred share redemption charge | 0 |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared ($0.45), and ($0.45) per share in September 30, 2012 and September 30, 2011, respectively | (63,184) |  |  |  |  |  |  |  |  |  |  | (61,294) | (1,890)
Ending Balance at Sep. 30, 2011 | 1,920,894 | 43 |  |  | 1,353 | 0 | 5,631 | (5,631) | 2,686,800 | 481,577 | (2,424) | (1,368,809) | 122,354
Ending Balance, shares at Sep. 30, 2011 |  | 4,300,000 |  |  | 135,579,643 | 0 | 292,646 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2011 |  | 43 |  |  |  | 0 |  |  |  | 477,338 |  |  | 33,105
Beginning Balance, shares at Dec. 31, 2011 |  | 4,300,000 |  |  |  | 0 |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 32,804 |  |  | 423
Ending Balance at Jun. 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2011 | 1,889,696 | 43 |  |  | 1,424 | 0 | 5,631 | (5,631) | 2,776,197 | 477,338 | (6,079) | (1,392,332) | 33,105
Beginning Balance, shares at Dec. 31, 2011 |  | 4,300,000 |  |  | 142,690,755 | 0 | 292,646 |  |  |  |  |  |
Net income (loss) | 33,227 |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | (14,580) |  |  |  |  |  |  |  |  |  | (14,377) |  | (203)
Preferred Stock, Shares Issued |  | 2,300,000 | 0 | 4,000,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Issued | 96,850 | 23 | 0 | 40 |  |  |  |  |  |  |  |  |
Preferred Stock, Including Additional Paid in Capital, Net of Discount |  |  |  |  |  |  |  |  | 96,810 |  |  |  |
Equity issuance costs | (610) |  |  |  |  |  |  |  | (610) |  |  |  |
Stock Redeemed or Called During Period, Shares |  |  | (2,000,000) |  |  |  |  |  |  |  |  |  |
Additional Paid in Capital, Preferred Stock |  |  |  |  |  |  |  |  | (47,890) |  |  |  |
Stock Redeemed or Called During Period, Value | (47,910) |  | (20) |  |  |  |  |  |  |  |  |  |
Conversion of LP Units to Common Shares | (231) |  |  |  | 1 |  |  |  | 149 | (49) |  |  | (332)
Conversion of LP Units to Common Shares, shares |  |  |  |  | 20,464 |  |  |  |  |  |  |  |
Bonus Share Issuance | 387 |  |  |  |  |  |  |  | 387 |  |  |  |
Bonus Share Issuance, shares |  |  |  |  | 35,703 |  |  |  |  |  |  |  |
Vesting of Restricted Shares | (1,291) |  |  |  | 3 |  |  |  | (1,294) |  |  |  |
Vesting of Restricted Shares, shares |  |  |  |  | 280,851 |  | 9,036 |  |  |  |  |  |
Restricted Share Amortization | 2,138 |  |  |  |  |  |  |  | 2,138 |  |  |  |
Vesting of Restricted Performance Units | (1,329) |  |  |  | 2 |  |  |  | (1,331) |  |  |  |
Vesting of Restricted Performance Units, shares |  |  |  |  | 249,797 |  |  |  |  |  |  |  |
Restricted Performance Units Amortization | 1,926 |  |  |  |  |  |  |  | 1,926 |  |  |  |
Exercise of Stock Options | 748 |  |  |  | 2 |  |  |  | 746 |  |  |  |
Exercise of Stock Options, shares | 165,159 |  |  |  | 165,159 |  |  |  |  |  |  |  |
Share Option Amortization | 1,121 |  |  |  |  |  |  |  | 1,121 |  |  |  |
Share Issuance from/to Deferred Compensation Plan | 0 |  |  |  |  |  | (279) | 279 |  |  |  |  |
Share Issuance from/to Deferred Compensation Plan, shares |  |  |  |  | (5,564) |  | 10,937 |  |  |  |  |  |
Stock Issued During Period, Value, Other | 15 |  |  |  |  |  |  |  | 15 |  |  |  |
Stock Issued During Period, Shares, Other |  |  |  |  | 1,336 |  |  |  |  |  |  |  |
Adjustment to Non-controlling Interest | 11 |  |  |  |  |  |  |  | 358 |  |  |  | (347)
Preferred Share distributions | (7,832) |  |  |  |  |  |  |  |  |  |  | (7,832) |
Preferred share redemption charge | (2,090) |  |  |  |  |  |  |  |  |  |  | (2,090) |
Distributions declared ($0.45), and ($0.45) per share in September 30, 2012 and September 30, 2011, respectively | (66,037) |  |  |  |  |  |  |  |  |  |  | (64,804) | (1,233)
Ending Balance at Sep. 30, 2012 | 1,884,209 | 63 |  |  | 1,432 | 0 | 5,352 | (5,352) | 2,828,722 | 510,093 | (20,456) | (1,467,058) | 31,413
Ending Balance, shares at Sep. 30, 2012 |  | 6,300,000 |  |  | 143,438,501 | 0 | 290,745 |  |  |  |  |  |
Beginning Balance at Jun. 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 17,089 |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive income (loss) | (4,081) |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  | 2,300,000 |  | 4,000,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Issued | 96,850 | 23 |  | 40 |  |  |  |  |  |  |  |  |
Preferred share redemption charge | 0 |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2012 | $ 1,884,209 | $ 63 |  |  |  | $ 0 |  |  |  |  |  |  |
Ending Balance, shares at Sep. 30, 2012 |  | 6,300,000 |  |  |  | 0 |  |  |  |  |  |  |

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