Summary of Significant Accounting Policies (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Number of Real Estate Properties	397
Number of Units in Real Estate Property	111,491
Noncontrolling Interests - Partially Owned Properties	$ 125,843,000	$ 126,583,000
Noncontrolling Interest Balance Limited Life Partnerships	(10,200,000)
Noncontrolling Interests Settlement Value	$ 53,200,000
Consolidated Properties [Member]
Number of Real Estate Properties	19
Number of Units in Real Estate Property	3,752
Limited Life Partnership Properties [Member]
Number of Real Estate Properties	6