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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Performing | $ 142,277 | $ 127,865
Allowance for doubtful accounts | 15,770 | 15,770
Deferred revenue from sales to related parties | 78,548 | 77,332
Accounts payable and other liabilities to related parties | $ 31,655 | $ 39,373
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) | 1,800,614 | 2,000,614
Series A Preferred stock, outstanding (in shares) | 1,800,614 | 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) | 16,412,861 | 15,930,145
Common stock, outstanding (in shares) | 15,997,076 | 15,514,360
Treasury stock (in shares) |  | 415,785
TCI [Member] | Common Stock [Member] |  |
Shares held by subsidiaries (in shares) | 140,000 | 140,000
Treasury stock (in shares) | 415,785 | 140,000
Series A Cumulative Convertible Preferred Stock [Member] |  |
Shares held by subsidiaries (in shares) | 900,000 | 900,000
Related Party [Member] |  |
Performing | $ 104,665 | $ 99,410
Allowance for doubtful accounts | 14,269 | 14,269
Deferred revenue from sales to related parties | 57,289 | 56,887
Accounts payable and other liabilities to related parties | $ 9,764 | $ 11,893

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