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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, Shares at Dec. 31, 2012 |  | 4,000,000 | 143,538,733 | 290,745 |  |  |  |  |  |
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
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income (loss) | 43,189 |  |  |  |  |  | 42,777 |  |  | 412
Other comprehensive income | 13,075 |  |  |  |  |  |  | 12,923 |  | 152
Issuance of Common Shares of Beneficial Interest, Shares |  |  | 12,650,000 |  |  |  |  |  |  |
Issuance of Common Shares of Beneficial Interest | 182,034 |  | $ 127 |  | 181,907 |  |  |  |  |
Issuance of partnership interest in joint venture | 946 |  |  |  |  |  |  |  |  | 946
Equity issuance costs | (744) |  |  |  | (744) |  |  |  |  |
Conversion of LP Units to Common Shares, Shares |  |  | 81,998 |  |  |  |  |  |  |
Conversion of LP Units to Common Shares |  |  | $ 1 |  | 1,239 |  |  |  |  | (1,240)
Bonus share issuance, Shares |  |  | 27,918 |  |  |  |  |  |  |
Bonus share issuance | 361 |  |  |  | 361 |  |  |  |  |
Share-based compensation activity, Shares |  |  | 438,356 | 34,117 |  |  |  |  |  |
Share-based compensation activity | 9,438 |  | $ 4 |  | 9,417 |  | 17 |  |  |
Share Issuance from/to Deferred Compensation Plan, Shares |  |  | (5,012) | (12,583) |  |  |  |  |  |
Share issuance from/to Deferred Compensation Plan |  |  |  | $ 55 |  | (55) |  |  |  |
Adjustment to Non-controlling Interest |  |  |  |  | (778) |  |  |  |  | 778
Preferred Share distributions | (6,900) |  |  |  |  |  |  |  | (6,900) |
Distributions declared | (93,480) |  |  |  |  |  |  |  | (92,409) | (1,071)
Ending Balance, Shares at Dec. 31, 2013 |  | 4,000,000 | 156,731,993 | 312,279 |  |  |  |  |  |
Ending Balance at Dec. 31, 2013 | 1,921,435 | $ 40 | $ 1,566 | $ 5,407 | 2,971,596 | (5,407) | 522,528 | (2,995) | (1,592,515) | 21,215
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income (loss) | 6,942 |  |  |  |  |  | 6,975 |  |  | (33)
Other comprehensive income | (1,630) |  |  |  |  |  |  | (1,612) |  | (18)
Issuance of Common Shares of Beneficial Interest, Shares |  |  | 21,850,000 |  |  |  |  |  |  |
Issuance of Common Shares of Beneficial Interest | 335,398 |  | $ 219 |  | 335,179 |  |  |  |  |
Equity issuance costs | (495) |  |  |  | (495) |  |  |  |  |
Conversion of LP Units to Common Shares, Shares |  |  | 228,536 |  |  |  |  |  |  |
Conversion of LP Units to Common Shares |  |  | $ 2 |  | 3,612 |  |  |  |  | (3,614)
Share-based compensation activity, Shares |  |  | 403,902 |  |  |  |  |  |  |
Share-based compensation activity | 6,847 |  | $ 6 |  | 6,857 |  | (16) |  |  |
Share Issuance from/to Deferred Compensation Plan, Shares |  |  | 80,152 | 72,257 |  |  |  |  |  |
Share issuance from/to Deferred Compensation Plan | (90) |  |  | $ 812 | (90) | (812) |  |  |  |
Share Choice Plan Issuance, Shares |  |  | (1,423) |  |  |  |  |  |  |
Adjustment to Non-controlling Interest |  |  |  |  | (1,966) |  |  |  |  | 1,966
Preferred Share distributions | (6,900) |  |  |  |  |  |  |  | (6,900) |
Distributions declared | (102,181) |  |  |  |  |  |  |  | (101,164) | (1,017)
Ending Balance, Shares at Dec. 31, 2014 |  | 4,000,000 | 179,293,160 | 384,536 |  |  |  |  |  |
Ending 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
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income (loss) | (30,740) |  |  |  |  |  | (30,401) |  |  | (339)
Other comprehensive income | $ (590) |  |  |  |  |  |  | (585) |  | (5)
Repurchase and retirement of Common Shares of Beneficial Interest, Shares | (5,209,437) |  | (5,209,437) |  |  |  |  |  |  |
Repurchase and retirement of Common Shares of Beneficial Interest | $ (67,325) |  | $ (52) |  | (67,273) |  |  |  |  |
Issuance of Common Shares of Beneficial Interest | 1,025 |  |  |  |  |  |  |  |  | 1,025
Equity issuance costs | (105) |  |  |  | (105) |  |  |  |  |
Bonus share issuance, Shares |  |  | 8,447 |  |  |  |  |  |  |
Bonus share issuance | $ 125 |  |  |  | 125 |  |  |  |  |
Share-based compensation activity, Shares | 5,097 |  | 509,675 | 280,011 |  |  |  |  |  |
Share-based compensation activity |  |  | $ 6 |  | 5,091 |  |  |  |  |
Share Issuance from/to Deferred Compensation Plan, Shares |  |  | 88,146 | 81,139 |  |  |  |  |  |
Share issuance from/to Deferred Compensation Plan | $ (2) |  |  | $ 5,699 | (2) | (5,699) |  |  |  |
Share Choice Plan Issuance, Shares |  |  | (1,423) |  |  |  |  |  |  |
Adjustment to Non-controlling Interest |  |  |  |  | 93 |  |  |  |  | (93)
Preferred Share distributions | (6,900) |  |  |  |  |  |  |  | (6,900) |
Distributions declared | (107,820) |  |  |  |  |  |  |  | (106,899) | (921)
Ending Balance, Shares at Dec. 31, 2015 |  | 4,000,000 | 174,688,568 | 745,686 |  |  |  |  |  |
Ending 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

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