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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Subsequent to December 31, 2017, we sold five centers and other property with approximate aggregate gross sales proceeds totaling $220.6 million, which were owned by us either directly or through our interest in real estate joint ventures or partnerships. No impairment losses will be realized associated with these dispositions.