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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Notes and interest receivable $ 138,290 $ 127,865
Allowance for doubtful accounts 14,270 15,770
Accumulated depreciation 76,482 177,546
Deferred revenue from sales to related parties 39,426 77,332
Accounts payable and other liabilities to related parties $ 37,304 $ 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
Related Party [Member]    
Notes and interest receivable $ 96,594 $ 99,410
Allowance for doubtful accounts 14,269 14,269
Deferred revenue from sales to related parties 33,083 56,887
Accounts payable and other liabilities to related parties $ 10,683 $ 11,893
TCI [Member] | Common Stock [Member]    
Shares held by subsidiaries (in shares) 140,000 140,000
Treasury stock (in shares) 415,785 140,000
Real Estate Held For Sale [Member]    
Accumulated depreciation $ 113,606  
Series A Cumulative Convertible Preferred Stock [Member]    
Shares held by subsidiaries (in shares) 900,000 900,000