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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Receivables, allowance | $ 1,353 | $ 855
Accrued rental income allowance | 3,154 | 3,270
Accumulated amortization - debt costs | 18,002 | 17,965
Unamortized premium - mortgages payable | 173 | 187
Unamortized discount - notes payable - convertible | 951 | 2,072
Unamortized discount - notes payable | $ 9,103 | $ 9,338
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) | 116,891,268 | 111,554,997
Common stock, shares outstanding (in shares) | 116,891,268 | 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
Series D Depositary Share [Member] |  |
Series D, depositary shares issued (in shares) | 11,500,000 | 0
Series D, depositary shares outstanding (in shares) | 11,500,000 | 0
Series D, stated liquidation value per share (in dollars per share) | $ 25 | $ 0

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