Equity Investments in Unconsolidated Real Estate Joint Ventures (Narrative) (Details) (USD $)	3 Months Ended			3 Months Ended			1 Months Ended		3 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2013 Altis at Kendall Square, LLC [Member] item	Mar. 31, 2014 Altis at Kendall Square, LLC [Member]	Dec. 31, 2013 Altis at Kendall Square, LLC [Member]	Apr. 30, 2014 New Urban/BBX Development, LLC [Member]	Dec. 31, 2013 New Urban/BBX Development, LLC [Member] item acre	Mar. 31, 2014 New Urban/BBX Development, LLC [Member]	Dec. 31, 2013 PGA Design Center Holdings, LLC [Member] sqft property	Mar. 31, 2014 PGA Design Center Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Total equity investments in unconsolidated real estate joint ventures	$ 3,346,000		$ 1,354,000	$ 1,300,000	$ 1,300,000	$ 1,300,000		$ 54,000	$ 69,000		$ 1,977,000
Number Of Apartments Units				321
Percent of proceeds from joint venture entitlement				13.00%
Internal rate of return, threshold				15.00%
Percent of proceeds from joint venture after internal rate of return, threshold				9.75%
Managers percent of proceeds from joint venture entitlement				83.00%
Area of Real Estate Property								2
Number of single family homes								30
Preferred membership interest								50.00%	50.00%		60.00%
Individual Contribution To Joint Venture							692,000
Investment in joint venture							3,600,000
Cash							1,800,000
Selling expense							200,000
Investment in company, promissory note							1,600,000
Carrying value of land									900,000
Number of buildings										3
Building Area										145,000
Purchase of property	14,000	27,000								6,100,000
Sale of commercial property to the joint venture											2,900,000
Percent of commercial property sold into joint venture											40.00%
Carrying value of commercial property sold into joint venture											1,900,000
Property contributed to the joint venture excluded certain residential development entitlements											$ 1,200,000