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Consolidated Statements of Beneficiaries' Equity - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Deferred Compensation, Share-based Payments [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, 2013 |  | 4,000,000 | 156,731,993 |  | 312,280 |  |  |  |  |
Beginning Balance at Dec. 31, 2013 | $ 1,921,435 | $ 40 | $ 1,566 | $ 2,971,596 | $ 5,407 | $ (5,407) | $ 522,528 | $ (2,995) | $ (1,592,515) | $ 21,215
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income | 8,811 |  |  |  |  |  | 8,754 |  |  | 57
Other comprehensive loss | 335 |  |  |  |  |  |  | 337 |  | (2)
Issuance of Common Shares of Beneficial Interest, Shares |  |  | 21,850,000 |  |  |  |  |  |  |
Issuance of Common Shares of Beneficial Interest | 335,398 |  | $ 219 | 335,179 |  |  |  |  |  |
Conversion of LP Units to Common Shares, Shares |  |  | 41,734 |  |  |  |  |  |  |
Conversion of LP Units to Common Shares | 0 |  |  | 655 |  |  |  |  |  | (655)
Equity Issuance Costs | (452) |  |  | (452) |  |  |  |  |  |
Share-based compensation activity, Shares |  |  | 279,913 |  |  |  |  |  |  |
Share-based compensation activity | 4,614 |  | $ 5 | 4,597 |  |  | 12 |  |  |
Share Issuance from/to Deferred Compensation Plan, Shares |  |  | 78,729 |  | 72,256 |  |  |  |  |
Share issuance from/to Deferred Compensation Plan | (90) |  |  | (90) | $ 812 | (812) |  |  |  |
Adjustment to non-controlling interest | 0 |  |  | (1,172) |  |  |  |  |  | 1,172
Preferred Share distributions | (5,175) |  |  |  |  |  |  |  | (5,175) |
Distributions declared | (74,986) |  |  |  |  |  |  |  | (74,198) | (788)
Ending Balance, Shares at Sep. 30, 2014 |  | 4,000,000 | 178,982,369 |  | 384,536 |  |  |  |  |
Ending Balance at Sep. 30, 2014 | 2,189,890 | $ 40 | $ 1,790 | 3,310,313 | $ 6,219 | (6,219) | 531,294 | (2,658) | (1,671,888) | 20,999
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 | 3,314,693 | $ 6,219 | (6,219) | 529,487 | (4,607) | (1,700,579) | 18,499
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
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) |  |  | (2) | $ 5,699 | (5,699) |  |  |  |
Adjustment to non-controlling interest | 0 |  |  | 93 |  |  |  |  |  | (93)
Preferred Share distributions | (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 | $ 3,258,075 | $ 11,918 | $ (11,918) | $ 561,227 | $ (8,490) | $ (1,786,374) | $ 18,927

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