CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Notes and interest receivable	$ 82,239	$ 70,166
Deferred revenue from related parties	23,044	60,949
Accumulated depreciation	$ 77,612	$ 178,590
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized	10,000,000	10,000,000
Common stock, issued	8,717,967	8,717,967
Common stock, outstanding	8,717,767	8,717,767
Treasury stock, shares	200	200
Series C Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized	10,000,000	10,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Series D Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized	100,000	100,000
Preferred stock, issued	100,000	100,000
Preferred stock, outstanding	100,000	100,000
Preferred stock, liquidation preference per share (in dollars per share)	$ 100	$ 100
Related Parties [Member]
Notes and interest receivable	$ 48,637	$ 45,155
Deferred revenue from related parties	16,701	40,574
Accounts payable and other liabilities to related parties (in dollars)	7,852	$ 7,236
Real Estate Held For Sale [Member]
Accumulated depreciation	$ 113,606