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Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Shares Of Beneficial Interest At Par Value [Member] | Additional Paid In Capital [Member] | Distributions In Excess Of Net Income Attributable To The Controlling Interests [Member] | AOCI Attributable to Parent [Member] | Total Shareholders' Equity [Member] | Noncontrolling Interests In Subsidiaries [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 796,143 | $ 664 | $ 1,145,515 | $ (354,122) | $ 0 | $ 792,057 | $ 4,086
Balance, shares at Dec. 31, 2012 |  | 66,437 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to the controlling interests | 37,346 |  |  | 37,346 |  | 37,346 |
Less: Net loss attributable to noncontrolling interests in subsidiaries | 0 |  |  |  |  |  |
Contributions from noncontrolling interest | 401 |  |  |  |  |  | 401
Dividends | (80,104) |  |  | (80,104) |  | (80,104) |
Share grants, net of share grant amorization and forfeitures | 5,660 | $ 1 | 5,659 |  |  | 5,660 |
Share grants, net of share grant amortization and forfeitures, shares |  | 94 |  |  |  |  |
Stock issued during period (in shares) |  | 0 |  |  |  |  |
Balance at Dec. 31, 2013 | 759,446 | $ 665 | 1,151,174 | (396,880) | 0 | 754,959 | 4,487
Balance, shares at Dec. 31, 2013 |  | 66,531 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to the controlling interests | 111,639 |  |  | 111,639 |  | 111,639 |
Less: Net loss attributable to noncontrolling interests in subsidiaries | (38) |  |  |  |  |  | (38)
Contributions from noncontrolling interest | 9 |  |  |  |  |  | 9
Dividends | (80,277) |  |  | (80,277) |  | (80,277) |
Share grants, net of share grant amorization and forfeitures | 2,544 | $ 2 | 2,542 |  |  | 2,544 |
Share grants, net of share grant amortization and forfeitures, shares |  | 163 |  |  |  |  |
Distributions to noncontrolling interests | (1,784) |  |  |  |  |  | (1,784)
Stock issued during period (in shares) |  | 1,125 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 30,690 | $ 11 | 30,679 |  |  | 30,690 |
Balance at Dec. 31, 2014 | 822,229 | $ 678 | 1,184,395 | (365,518) | 0 | 819,555 | 2,674
Balance, shares at Dec. 31, 2014 |  | 67,819 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to the controlling interests | 89,740 |  |  | 89,740 |  | 89,740 |
Less: Net loss attributable to noncontrolling interests in subsidiaries | (553) |  |  |  |  |  |
Contributions from noncontrolling interest | 5 |  |  |  |  |  | 5
Dividends | (82,003) |  |  | (82,003) |  | (82,003) |
Share grants, net of share grant amorization and forfeitures | 3,692 | $ 2 | 3,690 |  |  | 3,692 |
Share grants, net of share grant amortization and forfeitures, shares |  | 188 |  |  |  |  |
Stock issued during period (in shares) |  | 184 |  |  |  |  |
Stock Issued During Period, Value, New Issues | 5,215 | $ 2 | 5,213 |  |  | 5,215 |
Noncontrolling Interest, Decrease from Deconsolidation | (1,316) |  |  |  |  |  | (1,316)
Unrealized loss on interest rate hedge | (550) |  |  |  | (550) | (550) |
Balance at Dec. 31, 2015 | $ 837,012 | $ 682 | $ 1,193,298 | $ (357,781) | $ (550) | $ 835,649 | $ 1,363
Balance, shares at Dec. 31, 2015 |  | 68,191 |  |  |  |  |

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