Investments In Joint Ventures (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Investments In Joint Ventures [Abstract]
Number of joint ventures accounted for under equity method investments				2	3	2
Equity method investment ownership percentage		20.00%		20.00%
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures		$ 0		$ 0
Fees earned for property and asset management, construction, development, and other services to joint ventures		2,000,000	2,400,000	6,600,000	7,500,000
Number of apartment homes in joint venture's operating properties sold	558
Proceeds from sale of 2 operating properties	65,600,000
Gain on sale of unconsolidated JV property	$ 3,600,000