Basis of Presentation Nature of Operations (Details)	Sep. 30, 2015 Property State
Real Estate Properties [Line Items]
Number of States in which Entity Operates | State	12
Number of Real Estate Properties	40
Mall [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	30
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	6
Development Properties [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	3
Redevelopment Properties [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	1
Other Development Property [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties	1