Consolidated Statements of Changes in Net Assets - Liquidation Value [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 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	(4,000)
Changes in liquidation value of investment in unconsolidated joint venture	6,774
Remeasurement of assets and liabilities	2,678	121
Net changes in liquidation value	5,452	121
Liquidating distributions to common stockholders	(335,858)
Changes in net assets in liquidation	(330,406)	121
Net assets in liquidation, end of period	$ 502,707	$ 1,553,047