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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 Loss [Member] | Cumulative Distributions [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance, Shares at Dec. 31, 2015 |  | 4,000,000 | 174,688,568 | 745,686 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2015 | $ 1,952,091 | $ 40 | $ 1,747 | $ 11,918 | $ 3,252,622 | $ (11,918) | $ 499,086 | $ (5,192) | $ (1,814,378) | $ 18,166
Net income | 46,310 |  |  |  |  |  | 45,921 |  |  | 389
Other comprehensive income (loss) | (9,159) |  |  |  |  |  |  | (9,079) |  | (80)
Issuance of partnership interest in consolidated real estate venture | 18 |  |  |  |  |  |  |  |  | 18
Share-based compensation activity, Shares |  |  | 210,116 |  |  |  |  |  |  |
Share-based compensation activity | 3,332 |  | $ 2 |  | 3,296 |  | 34 |  |  |
Share Issuance from/(to) Deferred Compensation Plan, Shares |  |  | (8,252) | 101,321 |  |  |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan |  |  |  | $ 1,237 |  | (1,237) |  |  |  |
Adjustment to Non-controlling Interest |  |  |  |  | (10) |  |  |  |  | 10
Preferred Share distributions | (1,725) |  |  |  |  |  |  |  | (1,725) |
Distributions declared | (26,577) |  |  |  |  |  |  |  | (26,347) | (230)
Ending Balance, Shares at Mar. 31, 2016 |  | 4,000,000 | 174,890,432 | 847,007 |  |  |  |  |  |
Ending Balance at Mar. 31, 2016 | 1,964,290 | $ 40 | $ 1,749 | $ 13,155 | 3,255,908 | (13,155) | 545,041 | (14,271) | (1,842,450) | 18,273
Beginning Balance, Shares at Dec. 31, 2016 |  | 4,000,000 | 175,140,760 | 899,457 |  |  |  |  |  |
Beginning 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
Net income | 21,271 |  |  |  |  |  | 21,102 |  |  | 169
Other comprehensive income (loss) | 1,300 |  |  |  |  |  |  | 1,288 |  | 12
Issuance of partnership interest in consolidated real estate venture | 29 |  |  |  |  |  |  |  |  | 29
Equity issuance costs | (219) |  |  |  | (219) |  |  |  |  |
Bonus share issuance, Shares |  |  | 6,752 |  |  |  |  |  |  |
Bonus share issuance | 110 |  |  |  | 110 |  |  |  |  |
Share-based compensation activity, Shares |  |  | 56,669 | 39,870 |  |  |  |  |  |
Share-based compensation activity | 3,770 |  |  |  | 3,769 |  | 1 |  |  |
Share Issuance from/(to) Deferred Compensation Plan, Shares |  |  | (354) | (2,388) |  |  |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan | (48) |  |  | $ 560 | (48) | (560) |  |  |  |
Share Choice Plan Issuance, Shares |  |  | (1,423) |  |  |  |  |  |  |
Adjustment to Non-controlling Interest |  |  |  |  | (23) |  |  |  |  | 23
Preferred Share distributions | (1,725) |  |  |  |  |  |  |  | (1,725) |
Distributions declared | (28,359) |  |  |  |  |  |  |  | (28,122) | (237)
Ending Balance, Shares at Mar. 31, 2017 |  | 4,000,000 | 175,202,404 | 936,939 |  |  |  |  |  |
Ending Balance at Mar. 31, 2017 | $ 1,879,566 | $ 40 | $ 1,752 | $ 14,244 | $ 3,262,459 | $ (14,244) | $ 560,422 | $ (457) | $ (1,961,739) | $ 17,089

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