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Disposals of Operating Properties and Impairment Charge (Details) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019 USD ($) property	Jun. 30, 2019 USD ($) property	Mar. 31, 2019 USD ($) property	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($) property	Mar. 31, 2018 USD ($) property	Sep. 30, 2019 USD ($) property	Sep. 30, 2018 USD ($)	Oct. 31, 2019 property	Aug. 31, 2019 property	Jul. 31, 2019 property	Jun. 29, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of operating properties							$ 460,694	$ 161,499
Gain (loss) on sale of operating properties, net	$ (5,714)	$ 24,100		$ 0			24,965	8,329
Impairment charges	8,538			$ 0			37,723	$ 38,847
Equity method investments, fair value												$ 10,000
Five Unnamed Impaired Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges		25,100
Real estate property, fair value disclosure		152,900
One Unnamed Impaired Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges	8,500
Real estate property, fair value disclosure	12,600						$ 12,600
Unnamed impaired property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges			$ 4,100			$ 24,100
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					2
Impairment charges					$ 14,800
Real estate property, fair value disclosure					30,400
Eight Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of operating properties	$ 213,300	$ 244,000
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
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 sales of operating properties					89,000
Disposal group, not discontinued operation, gain (loss) on disposal					$ 7,800
Trussville Promenade and Memorial Commons
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of operating properties			63,000
Disposal group, not discontinued operation, gain (loss) on disposal			500
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			$ 24,300
TH Joint Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage (as a percent)												20.00%
Noncontrolling interest, ownership percentage by parent (as percent)												80.00%
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]
Consideration for property contributed												$ 99,800
Equity method investment, ownership percentage (as a percent)												20.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations
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
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 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								1	2
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 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
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 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
Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 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									1

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