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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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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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Disposals of Operating Properties and Impairment Charges - Additional Information (Details) $ in Thousands		3 Months Ended								6 Months Ended	12 Months Ended
	Jun. 29, 2018 USD ($) property	Dec. 31, 2018 USD ($) property	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) property	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($) property	Dec. 31, 2016 USD ($) property	Feb. 27, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties (in properties) \| property		6									6
Proceeds from sale of real estate											$ 218,387	$ 76,075	$ 14,187
Gains on sale of operating properties, net		$ (4,725)	$ (177)	$ 7,829	$ 500	$ 0	$ 0	$ 6,290	$ 8,870		3,424	15,160	4,253
Depreciation and amortization											70,360	7,411	174,564
Property, plant, and equipment, fair value disclosure						$ 26,000						26,000
Four unnamed impaired properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization											31,500
Property, plant, and equipment, fair value disclosure		$ 75,500									75,500
Two unnamed impaired properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization				14,800						$ 14,800
Property, plant, and equipment, fair value disclosure				$ 30,400						$ 30,400
Unnamed impaired property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization					24,100
Property, plant, and equipment, fair value disclosure					$ 24,300
Scenario, Plan \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate held-for-sale														$ 500,000
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]
Proceeds from sale of real estate	$ 89,000
Gains on sale of operating properties, net	3,400
Gain on disposal	$ 7,800
Cove Center, Clay Marketplace, Shops at Village Walk and Wheatland Towne Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate												76,100
Gain on disposal												$ 15,200
Publix at St. Cloud and Shops at Otty
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of real estate													14,200
Gain on disposal													$ 4,300
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 (in properties) \| property	3
Consideration received	$ 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 \| Two 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		1									1
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 (in properties) \| property		6									6
Disposed of by sale \| Cove Center, Clay Marketplace, Shops at Village Walk and Wheatland Towne Crossing
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties (in properties) \| property						4						4
Disposed of by sale \| Publix at St. Cloud and Shops at Otty
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties (in properties) \| property													2