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Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 21 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 Properties | Sep. 30, 2012 Discontinued Operations [Member] | Sep. 30, 2011 Discontinued Operations [Member] | Sep. 30, 2012 Discontinued Operations [Member] Properties | Sep. 30, 2011 Discontinued Operations [Member] | Sep. 30, 2012 Discontinued Operations [Member] Properties
Revenue: |  |  |  |  |  |  |  |  |  |
Rents | $ 113,989 | $ 116,251 | $ 343,260 | $ 346,579 |  | $ 271 | $ 5,450 | $ 6,384 | $ 16,742 |
Tenant Reimbursements | 20,695 | 19,010 | 58,308 | 59,187 |  | (16) | 797 | 742 | 2,728 |
Gain (Loss) on Contract Termination | 931 | 157 | 2,522 | 2,673 |  | 4 | 33 | 11 | 33 |
Other | 1,761 | 955 | 4,259 | 3,314 |  | (1) | (2) | 88 | 0 |
Total revenue | 140,383 | 139,401 | 417,370 | 420,267 |  | 258 | 6,278 | 7,225 | 19,503 |
Expenses: |  |  |  |  |  |  |  |  |  |
Property operating expenses | 40,705 | 40,788 | 118,068 | 124,023 |  | 154 | 1,573 | 1,855 | 5,212 |
Real estate taxes | 14,064 | 13,204 | 42,292 | 40,699 |  | 29 | 659 | 755 | 2,105 |
Depreciation and amortization | 48,738 | 51,943 | 147,618 | 157,157 |  | 6 | 2,296 | 2,750 | 6,857 |
Total operating expenses | 110,885 | 113,491 | 329,999 | 344,585 |  | 189 | 4,528 | 5,360 | 14,174 |
Investment Income, Interest | 311 | 523 | 2,635 | 1,385 |  | 0 |  | 2 |  |
Income from discontinued operations before gain on sale of interests in real estate | 69 | 1,750 | 1,867 | 5,329 |  | 69 | 1,750 | 1,867 | 5,329 |
Net gain on disposition of discontinued operations | 9,940 | 0 | 34,774 | 3,836 |  | 9,940 | 0 | 34,774 | 3,836 |
Income from discontinued operations | $ 10,009 | $ 1,750 | $ 36,641 | $ 9,165 |  | $ 10,009 | $ 1,750 | $ 36,641 | $ 9,165 |
Number of properties sold (in properties) |  |  |  |  | 2 |  |  | 14 |  | 18

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