Basis of Presentation Nature of Operations (Details)	3 Months Ended
	Mar. 31, 2016 Property State
Real Estate Properties [Line Items]
Percentage of consolidated revenue having no single tenant	10.00%
Number of States in which Entity Operates | State	11
Number of Real Estate Properties	33
Mall [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	25
Mixed Use Development Property [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	2
Strip And Power Center [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	4
Development Properties [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	4
Other Development Property [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	1