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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Performing | $ 140,483 | $ 149,484
Allowance for doubtful accounts | 18,279 | 18,279
Deferred revenue from sales to related parties | $ 72,633 | $ 74,409
Series A Preferred stock, par value | $ 2 | $ 2
Series A Preferred stock, shares authorized | 15,000,000 | 15,000,000
Series A Preferred stock, shares issued | 2,000,614 | 2,461,252
Series A Preferred stock, shares outstanding | 2,000,614 | 2,461,252
Series A Preferred stock, liquidation preference per share | $ 10 | $ 10
Series A Preferred stock, liquidation preference shares | 900,000 | 900,000
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 100,000,000 | 100,000,000
Common stock, shares issued | 15,930,145 | 14,443,404
Common stock, shares outstanding | 15,514,360 | 14,027,619
Shares held by TCI | 140,000 | 140,000
Treasury stock, shares | 415,785 | 415,785
Related Party [Member] |  |
Depreciation of Real Estate subject to sales contracts at cost | $ 2,475 | $ 2,300
Performing | 130,587 | 139,466
Allowance for doubtful accounts | 15,537 | 15,537
Deferred revenue from sales to related parties | 72,564 | 72,564
Accounts payable and other liabilities to related parties | $ 6,732 | $ 11,024

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