Fair Value Measurements (Narrative) (Details)	12 Months Ended
Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) Property	Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of fixed rate mortgage loans payable	$ 131,800,000	$ 159,000,000.0
Carrying value of fixed rate mortgage payable	131,500,000	156,800,000
Deferred compensation assets	0
Deferred compensation liabilities	0
Interest rate swap	0
Impairment charges	$ 9,350,000	65,975,000	$ 7,607,000
Aggregate fair value of impairment charges		84,800,000
Real estate held for sale		757,037,000
Level 2 [Member] \| Assets [Member] \| Retail Properties [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges		$ 43,300,000
Number of properties \| Property		37
Real estate held for sale		$ 757,000,000.0
Dual-track Strategic Alternatives Process [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges		$ 58,500,000

Aggregate fair value of impairment charges.

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Amount classified as assets attributable to disposal group held for sale or disposed of.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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

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