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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Series D Depositary Share [Member] | Dec. 31, 2012 Series D Depositary Share [Member] | Jun. 30, 2013 Series E Depositary Share [Member] | Dec. 31, 2012 Series E Depositary Share [Member]
--- | --- | --- | --- | --- | --- | ---
Receivables, allowance | $ 1,923,000 | $ 855,000 |  |  |  |
Accrued rental income allowance | 3,153,000 | 3,270,000 |  |  |  |
Accumulated amortization - debt costs | 18,902,000 | 17,965,000 |  |  |  |
Unamortized premium - mortgages payable | 158,000 | 187,000 |  |  |  |
Unamortized discount - notes payable - convertible | 0 | 2,072,000 |  |  |  |
Unamortized discount - notes payable | $ 11,413,000 | $ 9,338,000 |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  |  |  |
Preferred stock, shares authorized (in shares) | 15,000,000 | 15,000,000 |  |  |  |
Series D, depositary shares issued (in shares) |  |  | 11,500,000 | 0 | 11,500,000 | 0
Series D, depositary shares outstanding (in shares) |  |  | 11,500,000 | 0 | 11,500,000 | 0
Series D, stated liquidation value per share (in dollars per share) |  |  | $ 25 | $ 0 | $ 25.0 | $ 0
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  |  |  |
Common stock, shares authorized (in shares) | 375,000,000 | 375,000,000 |  |  |  |
Common stock, shares issued (in shares) | 119,287,073 | 111,554,997 |  |  |  |
Common stock, shares outstanding (in shares) | 119,287,073 | 111,554,997 |  |  |  |
Excess stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  |  |  |
Excess stock, shares authorized (in shares) | 390,000,000 | 390,000,000 |  |  |  |
Excess stock, shares issued (in shares) | 0 | 0 |  |  |  |
Excess stock, shares outstanding (in shares) | 0 | 0 |  |  |  |

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