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Disposed Assets - Schedule of Disposal Groups (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square footage of asset	501,276
Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square footage of asset	12,253,822
Disposed of by Sale | Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 152,630
Square footage of asset	1,231,000
Disposed of by Sale | Retail | Penn Park, Oklahoma City, OK
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 29,050
Square footage of asset	242,000
Disposed of by Sale | Retail | Sparks Crossing, Sparks, NV
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 40,280
Square footage of asset	336,000
Disposed of by Sale | Retail | Lincoln Village, Chicago, IL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 30,000
Square footage of asset	164,000
Disposed of by Sale | Retail | Pavilions At Hartman Heritage, Independence, MO
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 21,700
Square footage of asset	223,000
Disposed of by Sale | Retail | Legacy Crossing, Marion, OH
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 10,250
Square footage of asset	134,000
Disposed of by Sale | Retail | Heritage Plaza, Chicago, IL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross Disposition Price | $	$ 21,350
Square footage of asset	132,000

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