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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, 2014 |  | 4,000,000 | 179,293,160 | 384,536 |  |  |  |  |  |
Beginning Balance at Dec. 31, 2014 | $ 2,159,326 | $ 40 | $ 1,793 | $ 6,219 | $ 3,314,693 | $ (6,219) | $ 529,487 | $ (4,607) | $ (1,700,579) | $ 18,499
Net income | 31,960 |  |  |  |  |  | 31,739 |  |  | 221
Other comprehensive loss | $ (3,917) |  |  |  |  |  |  | (3,883) |  | (34)
Repurchase and retirement of Common Shares of Beneficial Interest, Shares | (4,701,302) |  | (4,701,302) |  |  |  |  |  |  |
Repurchase and retirement of Common Shares of Beneficial Interest | $ (60,817) |  | $ (47) |  | (60,770) |  |  |  |  |
Issuance of partnership interest in joint venture | 1,025 |  |  |  |  |  |  |  |  | 1,025
Bonus share issuance, Shares |  |  | 8,447 |  |  |  |  |  |  |
Bonus share issuance | 125 |  |  |  | 125 |  |  |  |  |
Equity issuance costs | (100) |  |  |  | (100) |  |  |  |  |
Share-based compensation activity, Shares |  |  | 509,675 | 280,011 |  |  |  |  |  |
Share-based compensation activity | 4,043 |  | $ 6 |  | 4,036 |  | 1 |  |  |
Share Issuance from/to Deferred Compensation Plan, Shares |  |  | 86,723 | 81,139 |  |  |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan | (2) |  |  | $ 5,699 | (2) | (5,699) |  |  |  |
Adjustment to Non-controlling Interest | 0 |  |  |  | 93 |  |  |  |  | (93)
Distribution to preferred shareholders | (5,175) |  |  |  |  |  |  |  | (5,175) |
Distributions declared | (81,311) |  |  |  |  |  |  |  | (80,620) | (691)
Ending Balance, Shares at Sep. 30, 2015 |  | 4,000,000 | 175,196,703 | 745,686 |  |  |  |  |  |
Ending Balance at Sep. 30, 2015 | 2,045,157 | $ 40 | $ 1,752 | $ 11,918 | 3,258,075 | (11,918) | 561,227 | (8,490) | (1,786,374) | 18,927
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 | 52,871 |  |  |  |  |  | 52,446 |  |  | 425
Other comprehensive loss | $ (9,946) |  |  |  |  |  |  | (9,860) |  | (86)
Repurchase and retirement of Common Shares of Beneficial Interest, Shares | 0 |  |  |  |  |  |  |  |  |
Repurchase and retirement of Common Shares of Beneficial Interest | $ (67,300) |  |  |  |  |  |  |  |  |
Issuance of partnership interest in consolidated real estate venture | 73 |  |  |  |  |  |  |  |  | 73
Conversion of LP Units to Common Shares, Shares |  |  | 55,303 |  |  |  |  |  |  |
Conversion of LP Units to Common Shares | 0 |  | $ 1 |  | 874 |  |  |  |  | (875)
Share-based compensation activity, Shares |  |  | 405,200 |  |  |  |  |  |  |
Share-based compensation activity | 4,934 |  | $ 4 |  | 4,890 |  | 40 |  |  |
Share Issuance from/to Deferred Compensation Plan, Shares |  |  | (8,311) | 153,771 |  |  |  |  |  |
Share Issuance from/(to) Deferred Compensation Plan | (47) |  |  | $ 1,766 | (47) | (1,766) |  |  |  |
Adjustment to Non-controlling Interest | 0 |  |  |  | (290) |  |  |  |  | 290
Distribution to preferred shareholders | (5,175) |  |  |  |  |  |  |  | (5,175) |
Distributions declared | (83,227) |  |  |  |  |  |  |  | (82,523) | (704)
Ending Balance, Shares at Sep. 30, 2016 |  | 4,000,000 | 175,140,760 | 899,457 |  |  |  |  |  |
Ending Balance at Sep. 30, 2016 | $ 1,911,574 | $ 40 | $ 1,752 | $ 13,684 | $ 3,258,049 | $ (13,684) | $ 551,572 | $ (15,052) | $ (1,902,076) | $ 17,289

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