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Disposals of Operating Properties and Impairment Charge (Details) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($) property	Jun. 30, 2019 USD ($) property	Mar. 31, 2019 USD ($)	Jun. 30, 2019 USD ($) property	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges	$ 0	$ 8,538				$ 0	$ 37,723
One Unnamed Impaired Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties (in properties) | property		1					1
Impairment charges							$ 8,500
Real estate property, fair value disclosure		$ 12,600					$ 12,600
Five Unnamed Impaired Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties (in properties) | property			5		5
Impairment charges					$ 25,100
Real estate property, fair value disclosure			$ 152,900		$ 152,900
Unnamed impaired property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges				$ 4,100
Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties (in properties) | property	0					0
Redevelopment Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties (in properties) | property	1					1
Proceeds from sales of operating properties	$ 14,000
Disposal group, not discontinued operation, gain (loss) on disposal	$ 3,100
Other Redevelopment Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties (in properties) | property	0					0
Eight Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties (in properties) | property		8	8		8		8
Proceeds from sales of operating properties		$ 213,300	$ 244,000
Disposal group, not discontinued operation, gain (loss) on disposal		$ 5,700	$ 24,100
Whitehall Pike
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of operating properties				13,500
Disposal group, not discontinued operation, gain (loss) on disposal				6,600
Fair Value, Inputs, Level 3 | Unnamed impaired property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate property, fair value disclosure				$ 10,000

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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