CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred revenue from related parties	$ 17,522	$ 60,949
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
Related Parties [Member]
Notes and interest receivable	$ 51,945	$ 45,155
Deferred revenue from related parties	21,034	40,574
Accounts payable and other liabilities to related parties (in dollars)	$ 3	$ 7,236
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	0	100,000
Preferred stock, liquidation preference per share (in dollars per share)	$ 100	$ 100