Acquisitions and Discontinued Operations (Narrative) (Details) (USD $)	1 Months Ended		3 Months Ended		12 Months Ended	1 Months Ended
	Feb. 28, 2014	Jan. 31, 2014 acre	Mar. 31, 2014 acre	Mar. 31, 2013 acre	Dec. 31, 2013	Apr. 30, 2014 Subsequent Event [Member] acre
Acres of land acquired		2.9				7.6
Payments to Acquire Land		$ 15,600,000				$ 23,800,000
Number of operating properties sold			0		12
Number of Apartment Units in operating Property Disposed	558				3,931
Acres of land sold			3.0	3.7		4.7
Sales price of land parcels			6,300,000	6,600,000		8,300,000
Gain on sale of land			$ 354,000	$ 698,000