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Organization (Details) ft² in Millions	3 Months Ended
	Mar. 31, 2018 joint_venture Assets	Mar. 31, 2018 Properties	Mar. 31, 2018 ft²	Mar. 31, 2018	Dec. 31, 2017 ft² Properties wholly_owned	Mar. 31, 2017 ft² joint_venture Properties
Entity Information [Line Items]
Number of retail properties		14		2	15
Square Feet			3.0		3.2	0.3
Number of operating real estate joint ventures | joint_venture	2					2
Corporate Joint Venture
Entity Information [Line Items]
Number of retail properties | joint_venture	1
Square Feet			3.0
Number of managed assets | Assets	14
Assets Leased to Others
Entity Information [Line Items]
Number of retail properties | Properties		1
Square footage occupied						69.90%
Retail
Entity Information [Line Items]
Number of retail properties | wholly_owned					71
Square Feet			11.2		12.4	12.7
Retail | Assets Leased to Others
Entity Information [Line Items]
Square footage occupied				93.60%	94.20%	93.30%
Retail
Entity Information [Line Items]
Number of retail properties | Properties		67				73

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Number Of Joint Ventures

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Number of Managed Assets

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Real Estate Property, Square Footage Occupied, Percent

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Area of a real estate property.

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The number of real estate properties owned as of the balance sheet date.

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