Summary of Significant Accounting Policies (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Number of Real Estate Properties	396
Number of Units in Real Estate Property	111,087
Noncontrolling Interests - Partially Owned Properties	$ 125,197,000	$ 126,583,000
Partially Owned Properties [Member]
Number of Real Estate Properties	19
Number of Units in Real Estate Property	3,771
Limited Life Partnership Properties [Member]
Number of Real Estate Properties	6
Noncontrolling Interest Balance Limited Life Partnerships	(10,200,000)
Noncontrolling Interests Settlement Value	$ 60,200,000