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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Series C Depositary Share [Member] | Dec. 31, 2011 Series C Depositary Share [Member] | Dec. 31, 2012 Series D Depositary Share [Member] | Dec. 31, 2011 Series D Depositary Share [Member]
--- | --- | --- | --- | --- | --- | ---
Receivables, allowance | $ 855 | $ 1,403 |  |  |  |
Accrued rental income allowance | 3,270 | 4,870 |  |  |  |
Accumulated amortization - debt costs | 17,965 | 15,381 |  |  |  |
Unamortized premium - mortgages payable | 187 | 0 |  |  |  |
Unamortized discount - notes payable - convertible | 2,072 | 6,363 |  |  |  |
Unamortized discount - notes payable | $ 9,338 | $ 5,033 |  |  |  |
Preferred stock, par value | $ 0.01 | $ 0.01 |  |  |  |
Preferred stock, shares authorized | 15,000,000 | 15,000,000 |  |  |  |
Depositary shares issued |  |  | 0 | 3,680,000 | 11,500,000 | 0
Depositary shares outstanding |  |  | 0 | 3,680,000 | 11,500,000 | 0
Stated liquidation value per share |  |  | $ 0 | $ 25 | $ 25 | $ 0
Common stock, par value | $ 0.01 | $ 0.01 |  |  |  |
Common stock, shares authorized | 375,000,000 | 375,000,000 |  |  |  |
Common stock, shares issued | 111,554,997 | 104,754,859 |  |  |  |
Common stock, shares issued and outstanding | 111,554,997 | 104,754,859 |  |  |  |
Excess stock, par value | $ 0.01 | $ 0.01 |  |  |  |
Excess stock, shares authorized | 390,000,000 | 390,000,000 |  |  |  |
Excess stock, shares issued | 0 | 0 |  |  |  |
Excess stock, shares outstanding | 0 | 0 |  |  |  |

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