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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Receivables, allowance | $ 1,057 | $ 1,403
Accrued rental income, allowance | 3,086 | 4,870
Accumulated amortization - debt costs | 17,887 | 15,381
Unamortized premium - mortgages payable | 202 | 0
Unamortized discount - notes payable - convertible | 3,174 | 6,363
Unamortized discount - notes payable | $ 9,571 | $ 5,033
Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, shares authorized (in shares) | 15,000,000 | 15,000,000
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) |  | 104,754,859
Common stock, shares issued and outstanding (in shares) | 109,421,774 | 104,754,859
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
Series D Depositary Share [Member] |  |
Series D and Series C, depositary shares issued (in shares) | 11,500,000 | 0
Series D and Series C, depositary shares outstanding (in shares) | 11,500,000 | 0
Series D and Series C, stated liquidation value per share (in dollars per share) | $ 25 | $ 0
Series C Depositary Share [Member] |  |
Series D and Series C, depositary shares issued (in shares) | 0 | 3,680,000
Series D and Series C, depositary shares outstanding (in shares) | 0 | 3,680,000
Series D and Series C, stated liquidation value per share (in dollars per share) | $ 0 | $ 25

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