Consolidated Statements of Changes in Net Assets - Liquidation Value [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net assets in liquidation, beginning of period	$ 833,113	$ 1,552,926
Changes in net assets in liquidation
Changes in liquidation value of investments in real estate	(9,000)	(143,025)
Changes in liquidation value of investment in unconsolidated joint venture	17,113	16,051
Remeasurement of assets and liabilities	3,201	(78,005)
Remeasurement of non-controlling interest		707
Net increase (decrease) in liquidation value	11,314	(204,272)
Liquidating distributions to common stockholders	(471,871)	(515,541)
Changes in net assets in liquidation	(460,557)	(719,813)
Net assets in liquidation, end of period	$ 372,556	$ 833,113