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Disposals of Operating Properties and Impairment Charges - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Jun. 29, 2018 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization	$ 0	$ 37,723	$ 70,360
Seven unnamed impaired properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property		7
Depreciation and amortization		$ 37,700
Property, plant, and equipment, fair value disclosure		176,000
Four unnamed impaired properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property			7
Depreciation and amortization			$ 70,400
Property, plant, and equipment, fair value disclosure			130,200
2020 Redevelopment Property Sold
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate		14,000
Gain on disposal		3,100
2019 Operating Properties Sold
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate		543,800
Gain on disposal		$ 39,000
Trussville Promenade, Memorial Commons, Lake Lofts at Deerwood, Hamilton Crossing, Fox Lake Crossing and Lowe's Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate			122,200
Livingston Shopping Center, Plaza Volente, and Tamiami Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal			$ 3,400
TH Joint Venture | Livingston Shopping Center, Plaza Volente, and Tamiami Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property			3	3
Consideration received			$ 99,800	$ 99,800
TH Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, ownership percentage by parent			80.00%
Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property	0
Disposed of by sale | 2020 Redevelopment Property Sold
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property		1
Disposed of by sale | 2019 Operating Properties Sold
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property		23
Disposed of by sale | Trussville Promenade, Memorial Commons, Lake Lofts at Deerwood, Hamilton Crossing, Fox Lake Crossing and Lowe's Plaza
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | property			6

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- Definition

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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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The number of real estate properties owned as of the balance sheet date.

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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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