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CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Debt Instrument [Line Items] |  |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 100,000,000 | 100,000,000
Common stock, shares issued (in shares) | 80,863,404 | 70,258,415
Common stock, shares outstanding (in shares) | 80,863,404 | 70,258,415
Mortgages and other notes payable |  |
Debt Instrument [Line Items] |  |
Unamortized loan costs | $ 11,111 | $ 10,567
Unamortized premiums | 1,524 | 1,364
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Unamortized loan costs | $ 1,673 | $ 1,155

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