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Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Total Shareholders' Equity [Member] | 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] | Accumulated Other Comprehensive Income [Member] | Noncontrolling Interests In Subsidiaries [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 749,063 | $ 745,255 | $ 599 | $ 944,825 | $ (198,412) | $ (1,757) | $ 3,808
Balance, shares at Dec. 31, 2009 |  |  | 59,811,000 |  |  |  |
Comprehensive income: |  |  |  |  |  |  |
Net income attributable to the controlling interests | 37,426 | 37,426 |  |  | 37,426 |  |
Net income attributable to noncontrolling interests | 133 |  |  |  |  |  | 133
Change in fair value of interest rate hedge | 288 | 288 |  |  |  | 288 |
Distributions to noncontrolling interests | (163) |  |  |  |  |  | (163)
Dividends | (108,949) | (108,949) |  |  | (108,949) |  |
Equity offerings, net of issuance costs | 168,880 | 168,880 | 56 | 168,824 |  |  |
Equity offerings, net of issuance costs, Shares |  |  | 5,645,000 |  |  |  |
Shares issued under Dividend Reinvestment Program | 5,286 | 5,286 | 2 | 5,284 |  |  |
Shares issued under Dividend Reinvestment Program, shares | 175,000 |  | 175,000 |  |  |  |
Share options exercised | 3,963 | 3,963 | 2 | 3,961 |  |  |
Share options exercised, shares | 164,300 |  | 164,000 |  |  |  |
Share grants, net of share grant amorization and forfeitures | 4,931 | 4,931 |  | 4,931 |  |  |
Share grants, net of share grant amortization and forfeitures, shares |  |  | 75,000 |  |  |  |
Balance at Dec. 31, 2010 | 860,858 | 857,080 | 659 | 1,127,825 | (269,935) | (1,469) | 3,778
Balance, shares at Dec. 31, 2010 |  |  | 65,870,000 |  |  |  |
Comprehensive income: |  |  |  |  |  |  |
Net income attributable to the controlling interests | 104,884 | 104,884 |  |  | 104,884 |  |
Net income attributable to noncontrolling interests | 494 |  |  |  |  |  | 494
Change in fair value of interest rate hedge | 1,469 | 1,469 |  |  |  | 1,469 |
Distributions to noncontrolling interests | (2,488) |  |  |  |  |  | (2,488)
Contribution from noncontrolling interest | 2,004 |  |  |  |  |  | 2,004
Dividends | (115,045) | (115,045) |  |  | (115,045) |  |
Shares issued under Dividend Reinvestment Program | 5,043 | 5,043 | 2 | 5,041 |  |  |
Shares issued under Dividend Reinvestment Program, shares | 171,000 |  | 170,000 |  |  |  |
Share options exercised | 1,292 | 1,292 | 1 | 1,291 |  |  |
Share options exercised, shares | 51,081 |  | 51,000 |  |  |  |
Share grants, net of share grant amorization and forfeitures | 4,321 | 4,321 |  | 4,321 |  |  |
Share grants, net of share grant amortization and forfeitures, shares |  |  | 174,000 |  |  |  |
Balance at Dec. 31, 2011 | 862,832 | 859,044 | 662 | 1,138,478 | (280,096) | 0 | 3,788
Balance, shares at Dec. 31, 2011 |  |  | 66,265,000 |  |  |  |
Comprehensive income: |  |  |  |  |  |  |
Net income attributable to the controlling interests | 23,708 | 23,708 |  |  | 23,708 |  |
Net income attributable to noncontrolling interests | 0 |  |  |  |  |  |
Change in fair value of interest rate hedge | 0 |  |  |  |  |  |
Contribution from noncontrolling interest | (298) |  |  |  |  |  | (298)
Dividends | (97,734) | (97,734) |  |  | (97,734) |  |
Shares issued under Dividend Reinvestment Program | 1,316 | 1,316 | 1 | 1,315 |  |  |
Shares issued under Dividend Reinvestment Program, shares | 55,000 |  | 55,000 |  |  |  |
Share options exercised | 1,153 | 1,153 |  | 1,153 |  |  |
Share options exercised, shares | 44,987 |  | 45,000 |  |  |  |
Share grants, net of share grant amorization and forfeitures | 4,570 | 4,570 | 1 | 4,569 |  |  |
Share grants, net of share grant amortization and forfeitures, shares |  |  | 72,000 |  |  |  |
Balance at Dec. 31, 2012 | $ 796,143 | $ 792,057 | $ 664 | $ 1,145,515 | $ (354,122) | $ 0 | $ 4,086
Balance, shares at Dec. 31, 2012 |  |  | 66,437,000 |  |  |  |

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