CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Real estate subject to sales contracts at cost, net	$ 0	$ 0
Performing	70,166	79,308
Allowance for doubtful accounts (in dollars)
Deferred revenue from related parties	$ 60,949	$ 71,065
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]
Performing	$ 45,155	$ 66,066
Allowance for doubtful accounts (in dollars)	0	0
Deferred revenue from related parties	40,574	50,689
Accounts payable and other liabilities to related parties (in dollars)	$ 7,236	$ 6,487
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
Preferred stock, liquidation preference per share (in dollars per share)	$ 100	$ 100
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