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Disposed Properties - Schedule of Disposal Groups (Details) ft² in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) ft²	Mar. 31, 2017 USD ($) ft²	Dec. 31, 2017 ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 127,500	$ 29,050
Square Feet	3,000	300	3,200
Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet	11,200	12,700	12,400
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 127,500
Square Feet	1,007
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail | Sherman Town Center I & II, Dallas-Fort Worth, TX
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 63,000
Square Feet	485
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail | Grafton Commons, Milwaukee-Racine-Waukesha, WI
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 33,500
Square Feet	239
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail | Lakeport Commons, Sioux City - Vermillion, IA-SD
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 31,000
Square Feet	283

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