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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Performing | $ 97,775 | $ 143,601
Non-Performing | 30,090 |
Allowance for doubtful accounts | 15,770 | 17,037
Deferred revenue from sales to related parties | 77,332 | 91,380
Accounts payable and other liabilities to related parties | $ 39,373 | $ 56,303
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 | 15,930,145
Common stock, outstanding (in shares) | 15,514,360 | 15,514,360
Shares held by subsidiaries (in shares) | 2,000,614 |
Treasury stock (in shares) | 415,785 | 415,785
Southern Properties Capital LTD [Member] | Common Stock [Member] |  |
Shares held by subsidiaries (in shares) | 140,000 | 140,000
Treasury stock (in shares) | 140,000 | 140,000
Series A Cumulative Convertible Preferred Stock [Member] |  |
Shares held by subsidiaries (in shares) | 900,000 | 900,000
Related Party [Member] |  |
Performing | $ 69,320 | $ 125,799
Non-Performing | 30,090 |
Allowance for doubtful accounts | 14,269 | 15,537
Deferred revenue from sales to related parties | 56,887 | 70,935
Accounts payable and other liabilities to related parties | $ 11,893 | $ 10,854

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