Basis of Presentation Nature of Operations (Details)	Aug. 03, 2015 Property State	Jun. 30, 2015 shares
Number of outstanding OP Units held by limited partners | shares		8,348,299
Subsequent Event [Member]
Number of Real Estate Properties	41
Number of States in which Entity Operates | State	12
Subsequent Event [Member] | Mall [Member]
Number of Real Estate Properties	31
Subsequent Event [Member] | Mixed Use Development Property [Member]
Number of Real Estate Properties	2
Subsequent Event [Member] | Strip And Power Center [Member]
Number of Real Estate Properties	3
Subsequent Event [Member] | Development Properties [Member]
Number of Real Estate Properties	4
Subsequent Event [Member] | Redevelopment Properties [Member]
Number of Real Estate Properties	3
Subsequent Event [Member] | Other Retail Development [Member]
Number of Real Estate Properties	1
Subsequent Event [Member] | Other Development Property [Member]
Number of Real Estate Properties	1