Basis of Presentation Nature of Operations (Details)	9 Months Ended
	Sep. 30, 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	31
Mall [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	23
Mixed Use Development Property [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	2
Retail Site [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	1
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