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Disposed Properties Disposed Properties (Details) $ in Thousands				6 Months Ended
	Jun. 23, 2017 USD ($) ft²	May 19, 2017 USD ($) ft²	Jan. 10, 2017 USD ($) ft²	Jun. 30, 2017 USD ($) ft²	Jun. 30, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross disposition price					$ 1,728,600
Retail [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross disposition price				$ 99,330
Square Footage | ft²				742,000
Retail [Member] | Penn Park Oklahoma City, OK [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal date			Jan. 10, 2017
Gross disposition price			$ 29,050
Square Footage | ft²			242,000
Retail [Member] | Sparks Crossing Sparks, NV [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal date		May 19, 2017
Gross disposition price		$ 40,280
Square Footage | ft²		336,000
Retail [Member] | Lincoln Village Chicago, IL [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal date	Jun. 23, 2017
Gross disposition price	$ 30,000
Square Footage | ft²	164,000

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