Summary of Significant Accounting Policies Text (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Partially Owned Unconsolidated Properties	3
Value of furniture and fixtures minimum range	$ 3,000
Value of furniture and fixtures maximum range	13,000
Lease Intangibles, Average Term	6
Capitalized Costs Development and Renovation	22,400,000	16,500,000	14,300,000
Accumulated Amortization, Deferred Finance Costs	37,700,000	33,400,000
Partially Owned Consolidated Properties	19
Partially Owned Consolidated Units	3,771
Noncontrolling Interests - Partially Owned Properties	124,909,000	126,583,000
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
Minimum [Member]
Retail/Commercial Leases Term	5
Maximum [Member]
Retail/Commercial Leases Term	10
Limited Life Partnership Properties [Member]
Partially Owned Limited Life Partnership Properties	6
Noncontrolling Interest Balance Limited Life Partnerships	(10,900,000)
Noncontrolling Interests Settlement Value	$ 62,900,000
Unconsolidated Operating [Domain]
Partially Owned Unconsolidated Properties	3