Summary of Significant Accounting Policies Text (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Number of Real Estate Properties	394
Value of furniture and fixtures minimum range	$ 10,000
Value of furniture and fixtures maximum range	$ 25,000
Lease Intangibles, Average Term	6
Capitalized Costs Development and Renovation	$ 22,300,000	$ 22,400,000	$ 16,500,000
Accumulated Amortization, Deferred Finance Costs	$ 45,400,000	37,700,000
Partially Owned Consolidated Properties	19
Partially Owned Consolidated Units	3,771
Partially Owned Properties	$ 4,608,000	$ 124,909,000
Furniture and Fixtures [Member]
Property, Plant and Equipment, Estimated Useful Lives	5
Furniture and Fixtures Maximum [Member]
Property, Plant and Equipment, Estimated Useful Lives	10
Building [Member]
Property, Plant and Equipment, Estimated Useful Lives	30
Building Improvements [Member]
Property, Plant and Equipment, Estimated Useful Lives	8
Replacements Minimum [Member]
Property, Plant and Equipment, Estimated Useful Lives	5
Replacements Maximum [Member]
Property, Plant and Equipment, Estimated Useful Lives	10
Renovations and Improvements Minimum [Member]
Property, Plant and Equipment, Estimated Useful Lives	5
Renovations and Improvements Maximum [Member]
Property, Plant and Equipment, Estimated Useful Lives	15
Limited Life Partnership Properties [Member]
Partially Owned Properties	$ 11,500,000
Partially Owned Limited Life Partnership Properties	6
Noncontrolling Interests Settlement Value	$ 75,100,000
Unconsolidated Properties [Member]
Number of Real Estate Properties	3
Partially Owned Properties	$ 90,878,000
Minimum [Member]
Retail/Commercial Leases Term	5
Maximum [Member]
Retail/Commercial Leases Term	10