Investments in Unconsolidated Affiliated Entities (Unaudited Condensed Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Brownmill, LLC [Member]
Equity method investment, assets	$ 19,183	$ 19,309
Member (deficit) capital	(2,316)	(2,390)
Total liabilities and members' capital	19,183	19,309
Brownmill, LLC [Member] | Investment property, at cost (net) [Member]
Equity method investment, assets	16,574	16,760
Brownmill, LLC [Member] | Cash and restricted cash [Member]
Equity method investment, assets	975	947
Brownmill, LLC [Member] | Other Assets [Member]
Equity method investment, assets	19,183	19,309
Brownmill, LLC [Member] | Other Liabilities [Member]
Equity method investment, liabilities	457	540
Brownmill, LLC [Member] | Mortgage payable [Member]
Equity method investment, liabilities	21,042	21,159
LVP Rego Park, LLC [Member]
Equity method investment, assets	19,201	18,579
Member (deficit) capital	19,201	18,579
Total liabilities and members' capital	19,201	18,579
LVP Rego Park, LLC [Member] | Cash and restricted cash [Member]
Equity method investment, assets	90	91
LVP Rego Park, LLC [Member] | Other Assets [Member]
Equity method investment, assets	19,201	18,579
LVP Rego Park, LLC [Member] | Mortgage Receivable [Member]
Equity method investment, assets	$ 19,068	$ 18,443