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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Notes and interest receivable $ 180,146 $ 169,299
Allowance for doubtful accounts 12,557 13,099
Deferred revenue 25,660 24,762
Accounts payable and other liabilities $ 23,508 $ 24,768
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 16,412,861
Common stock, outstanding (in shares) 15,997,076 15,997,076
Treasury stock (in shares) 415,785 415,785
TCI [Member]    
Common stock, outstanding (in shares) 140,000 140,000
Treasury stock (in shares) 140,000 140,000
Series A Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 2.00 $ 2.00
Preferred stock, authorized (in shares) 15,000,000 15,000,000
Preferred stock, issued (in shares) 1,800,614 1,800,614
Preferred stock, outstanding (in shares) 614 614
Preferred stock, liquidation preference (in dollars per share) $ 10 $ 10
Series A Preferred Stock [Member] | ARL and Subsidiaries [Member]    
Preferred stock, issued (in shares) 1,800,000 1,800,000
Related Parties [Member]    
Notes and interest receivable $ 110,827 $ 106,081
Allowance for doubtful accounts 12,557 13,099
Deferred revenue 25,660 24,762
Accounts payable and other liabilities $ 12,267 $ 11,817