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Consolidated Statements of Beneficiaries' Equity - USD ($) $ in Thousands | Total | 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, 2015 | $ 1,952,091 | $ 40 | $ 1,747 | $ 11,918 | $ 3,252,622 |  |  | $ (5,192) | $ (1,814,378) | $ 18,166
Beginning Balance, Shares at Dec. 31, 2015 |  | 4,000,000 | 174,688,568 | 745,686 |  | (11,918) | 499,086 |  |  |
Net income | 40,501 |  |  |  |  |  | $ 40,191 |  |  | 310
Other comprehensive income | 3,475 |  |  |  |  |  |  | 3,447 |  | 28
Issuance of partnership interest in consolidated real estate venture | 108 |  |  |  |  |  |  |  |  | 108
Conversion of LP Units to Common Shares | $ 0 |  | $ 1 |  | 874 |  |  |  |  | (875)
Conversion of LP Units to Common Shares, Shares |  |  | 55,303 |  |  |  |  |  |  |
Repurchase and retirement of Common Shares of Beneficial Interest, Shares | 0 |  |  |  |  |  |  |  |  |
Share-based compensation activity | $ 5,764 |  | $ 4 |  | 5,718 |  | 42 |  |  |
Share-based compensation activity, Shares |  |  | 405,200 |  |  |  |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan | (47) |  |  | $ 1,766 | (47) | $ (1,766) |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan, Shares |  |  | (8,311) | 153,771 |  |  |  |  |  |
Reallocation of Noncontrolling Interest | 0 |  |  |  | (297) |  |  |  |  | 297
Preferred Share distributions | (6,900) |  |  |  |  |  |  |  | (6,900) |
Distributions declared | (111,555) |  |  |  |  |  |  |  | (110,614) | (941)
Ending Balance at Dec. 31, 2016 | 1,883,437 | $ 40 | $ 1,752 | $ 13,684 | 3,258,870 | (13,684) | 539,319 | (1,745) | (1,931,892) | 17,093
Ending Balance, Shares at Dec. 31, 2016 |  | 4,000,000 | 175,140,760 | 899,457 |  |  |  |  |  |
Net income | 121,859 |  |  |  |  |  | 120,850 |  |  | 1,009
Other comprehensive income | 4,178 |  |  |  |  |  |  | 4,144 |  | 34
Issuance of partnership interest in consolidated real estate venture | 85 |  |  |  |  |  |  |  |  | 85
Conversion of LP Units to Common Shares, Shares |  |  | 2,858,991 |  |  |  |  |  |  |
Issuance of Common Shares of Beneficial Interest | 51,225 |  | $ 29 |  | 51,196 |  |  |  |  |
Redemption of Preferred Shares | $ (96,850) | $ (40) |  |  | (96,810) |  |  |  |  |
Redemption of Preferred Shares, Shares |  | (4,000,000) |  |  |  |  |  |  |  |
Repurchase and retirement of Common Shares of Beneficial Interest, Shares | 0 |  |  |  |  |  |  |  |  |
Distributions from consolidated real estate ventures | $ (48) |  |  |  |  |  |  |  |  | (48)
Equity issuance costs | (499) |  |  |  | (499) |  |  |  |  |
Bonus share issuance | 110 |  |  |  | 110 |  |  |  |  |
Share-based compensation activity | 6,697 |  | $ 3 |  | 6,689 |  | 5 |  |  |
Share-based compensation activity, Shares |  |  | 333,127 | 39,870 |  |  |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan | $ (768) |  |  | $ (1,239) | (768) | 1,239 |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan, Shares |  |  | (52,971) | (44,591) |  |  |  |  |  |
Share Choice Plan Issuance, Shares | 0 |  | (1,423) |  |  |  |  |  |  |
Reallocation of Noncontrolling Interest | $ 0 |  |  |  | (224) |  |  |  |  | 224
Preferred Share distributions | (2,032) |  |  |  |  |  |  |  | (2,032) |
Preferred Share redemption charges | (3,181) |  |  |  |  |  |  |  | (3,181) |
Distributions declared | (117,613) |  |  |  |  |  |  |  | (116,636) | (977)
Ending Balance at Dec. 31, 2017 | 1,846,600 | $ 0 | $ 1,784 | $ 12,445 | 3,218,564 | (12,445) | 660,174 | 2,399 | (2,053,741) | 17,420
Ending Balance, Shares at Dec. 31, 2017 |  | 0 | 178,285,236 | 894,736 |  |  |  |  |  |
Bonus share issuance, Shares |  |  | 6,752 |  |  |  |  |  |  |
Net income | 137,289 |  |  |  |  |  | 136,324 |  |  | 965
Other comprehensive income | 2,669 |  |  |  |  |  |  | 2,630 |  | 39
Issuance of partnership interest in consolidated real estate venture | 16 |  |  |  |  |  |  |  |  | 16
Conversion of LP Units to Common Shares, Shares |  |  | 23,311 |  |  |  |  |  |  |
Issuance of Common Shares of Beneficial Interest | 416 |  |  |  | 416 |  |  |  |  |
Repurchase and retirement of Common Shares of Beneficial Interest | $ (21,858) |  | $ (17) |  | (21,841) |  |  |  |  |
Repurchase and retirement of Common Shares of Beneficial Interest, Shares | (1,729,278) |  | (1,729,278) |  |  |  |  |  |  |
Distributions from consolidated real estate ventures | $ (94) |  |  |  |  |  |  |  |  | (94)
Redemption of LP Units | (7,043) |  |  |  |  |  |  |  |  | (7,043)
Share-based compensation activity | 5,843 |  | $ 2 |  | 5,826 |  | 15 |  |  |
Share-based compensation activity, Shares |  |  | 196,151 |  |  |  |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan | $ (111) |  | $ 1 | $ 1,576 | (112) | (1,576) |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan, Shares |  |  | 99,189 | 82,384 |  |  |  |  |  |
Share Choice Plan Issuance, Shares | 0 |  | (1,285) |  |  |  |  |  |  |
Reallocation of Noncontrolling Interest | $ 0 |  |  |  | (2,003) |  |  |  |  | 2,003
Preferred Share distributions | 0 |  |  |  |  |  |  |  |  |
Distributions declared | (131,154) |  |  |  |  |  |  |  | (130,168) | (986)
Ending Balance at Dec. 31, 2018 | $ 1,832,573 | $ 0 | $ 1,770 | $ 14,021 | $ 3,200,850 | $ (14,021) | $ 796,513 | $ 5,029 | $ (2,183,909) | $ 12,320
Ending Balance, Shares at Dec. 31, 2018 |  | 0 | 176,873,324 | 977,120 |  |  |  |  |  |

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