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CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Performing | $ 140,891 | $ 137,280
Allowance for doubtful accounts | 17,037 | 17,037
Deferred revenue from sales to related parties | 91,360 | 91,336
Accounts payable and other liabilities to related parties | $ 36,989 | $ 44,383
Series A Preferred stock, par value (in dollars per share) | $ 2.00 | $ 2.00
Series A Preferred stock, authorized (in shares) | 15,000,000 | 15,000,000
Series A Preferred stock, issued (in shares) | 2,000,614 | 2,000,614
Series A Preferred stock, outstanding (in shares) | 2,000,614 | 2,000,614
Series A Preferred stock, liquidation preference (in dollars per share) | $ 10 | $ 10
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, authorized (in shares) | 100,000,000 | 100,000,000
Common stock, issued (in shares) | 15,930,145 | 14,443,404
Common stock, outstanding (in shares) | 15,514,360 | 14,027,619
Shares held by subsidiaries (in shares) | 2,000,614 | 2,000,614
Treasury stock (in shares) | 415,785 | 415,785
Series A Cumulative Convertible Preferred Stock [Member] |  |
Shares held by subsidiaries (in shares) | 900,000 | 900,000
Transcontinential Realty Investors [Member] | Common Stock [Member] |  |
Shares held by subsidiaries (in shares) | 140,000 | 140,000
Treasury stock (in shares) | 140,000 | 140,000
Related Party [Member] |  |
Performing | $ 128,548 | $ 125,915
Allowance for doubtful accounts | 15,537 | 15,537
Deferred revenue from sales to related parties | 70,915 | 70,892
Accounts payable and other liabilities to related parties | $ 10,112 | $ 10,013

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