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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Performing $ 144,526 $ 127,865
Allowance for doubtful accounts 15,770 15,770
Deferred revenue from sales to related parties 77,342 77,332
Accounts payable and other liabilities to related parties $ 28,082 $ 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) 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) 16,412,861 15,930,145
Common stock, outstanding (in shares) 15,997,076 15,514,360
Treasury stock (in shares) 415,785 415,785
TCI [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 $ 105,566 $ 99,410
Allowance for doubtful accounts 14,269 14,269
Deferred revenue from sales to related parties 56,966 56,887
Accounts payable and other liabilities to related parties $ 11,357 $ 11,893