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Disposed Assets - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 30, 2017 USD ($)	Sep. 30, 2017 USD ($) Property	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Property Properties	Sep. 30, 2016 USD ($) Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of investment properties, net				$ 162,512	$ 1,533,492
Gain on sale of investment properties, net		$ 7,253	$ 29,586	$ 21,634	105,998
Number of surrendered properties | Property				1,000
Gain on extinguishment of debt		(41)	(4,645)	$ 840	(10,317)
Gain on sale of assets		$ 10,115	$ 10,494	10,115	$ 235,780
Intech Retail [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on extinguishment of debt				882
Worldgate Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross disposition price	$ 53,500
Gain on sale of assets				$ 10,115
Non-core
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of disposed assets | Properties				1	1
Retail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of disposed assets | Properties				6	24
Retail | Non-core
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross disposition price				$ 206,130	$ 1,887,550
Assets Surrendered
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of surrendered properties | Property		1

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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