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Organization (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2017 joint_venture Assets	Dec. 31, 2016 wholly_owned Assets	Sep. 30, 2017 partially_owned_asset	Sep. 30, 2017 wholly_owned	Sep. 30, 2017 ft²	Sep. 30, 2017	Sep. 30, 2017 Assets
Entity Information [Line Items]
Number of real estate properties		72					74
Square footage of asset					501,276
Number of operating real estate joint ventures | joint_venture	2
Non-core
Entity Information [Line Items]
Number of real estate properties | wholly_owned		1
Corporate Joint Venture
Entity Information [Line Items]
Number of real estate properties | joint_venture	1
Square footage of asset					2,977,303
Number of managed assets | Assets	15	15
Assets Leased to Others
Entity Information [Line Items]
Square footage occupied						98.00%
Retail
Entity Information [Line Items]
Number of real estate properties		71	2	70
Square footage of asset					12,253,822
Retail | Assets Leased to Others
Entity Information [Line Items]
Square footage occupied						94.40%

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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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