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Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.

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Capital Expenditure Per Square Foot

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Lessee, Operating Lease, Extension Term

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Market Rent Per Square foot

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The number of properties sold during the period.

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Fair Value Measurements - Impairment Narratives (Details) $ in Thousands	1 Months Ended				12 Months Ended
	Jan. 31, 2024 property	Mar. 31, 2023 property	Aug. 31, 2022 property	Mar. 31, 2022 property	Dec. 31, 2023 USD ($) property $ / ft²	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($)	Sep. 30, 2022 $ / ft²
Fair Value Measurement Inputs and Valuation Techniques
Impairment charges — real estate					$ 86,411	$ 39,119	$ 24,246
Impairment charges — Investment Management goodwill					$ 0	29,334	0
Investment Management Segment
Fair Value Measurement Inputs and Valuation Techniques
Impairment charges — Investment Management goodwill						29,334
Goodwill, fair value						$ 0
Discontinued Operations, Held-for-sale
Fair Value Measurement Inputs and Valuation Techniques
Number of properties (property) \| property					2	3
Subsequent Event
Fair Value Measurement Inputs and Valuation Techniques
Number of properties (property) \| property	2
Level 3 \| Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques
Impairment Charges					$ 86,411	$ 68,453	31,076
Real estate and intangibles \| Pendragon PLC
Fair Value Measurement Inputs and Valuation Techniques
Number of properties (property) \| property				30
Lease extension term				11 years
Real estate and intangibles \| Pendragon PLC \| Discontinued Operations, Held-for-sale
Fair Value Measurement Inputs and Valuation Techniques
Number of properties (property) \| property				12
Number of properties sold \| property						4
Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques
Impairment Charges					$ 86,411	$ 39,119	24,246
Number of properties (property) \| property						2
Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Pendragon PLC \| Discontinued Operations, Held-for-sale
Fair Value Measurement Inputs and Valuation Techniques
Impairment Charges						$ 9,300
Number of properties (property) \| property					6
Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Terminal Capitalization Rate \| Pendragon PLC \| Discontinued Operations, Held-for-sale \| Minimum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)					0.0475
Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Terminal Capitalization Rate \| Pendragon PLC \| Discontinued Operations, Held-for-sale \| Maximum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)					0.1000
Equity method investments \| Level 3 \| Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques
Impairment Charges					$ 0	0	6,830
Asset impairment charges							$ 6,800
Equity method investments \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Cashflow Discount Rate
Fair Value Measurement Inputs and Valuation Techniques
Equity measurement input (percent)							0.0575
Equity method investments \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Residual Discount Rate
Fair Value Measurement Inputs and Valuation Techniques
Equity measurement input (percent)							0.0750
Equity method investments \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Residual Capitalization Rate
Fair Value Measurement Inputs and Valuation Techniques
Equity measurement input (percent)							0.0675
Eleven Properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques
Impairment Charges					$ 39,100	$ 39,100
Number of properties (property) \| property					3	11
Impaired properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques
Impairment Charges						$ 12,400
Number of properties (property) \| property						3
Number of properties sold \| property		1	1
Impaired properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Subsequent Event
Fair Value Measurement Inputs and Valuation Techniques
Number of properties sold \| property	1
Potentially vacant properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques
Impairment Charges						$ 10,900	$ 16,300
Capital expenditure (usd per sqft) \| $ / ft²								100
Potentially vacant properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Minimum
Fair Value Measurement Inputs and Valuation Techniques
Market rent (usd per sqft) \| $ / ft²								10
Potentially vacant properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Maximum
Fair Value Measurement Inputs and Valuation Techniques
Market rent (usd per sqft) \| $ / ft²								11
Potentially vacant properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Cashflow Discount Rate
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)					0.140
Potentially vacant properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Cashflow Discount Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)								0.0700
Potentially vacant properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Cashflow Discount Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)								0.0900
Potentially vacant properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Terminal Capitalization Rate
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)					0.110
Potentially vacant properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Terminal Capitalization Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)								0.0600
Potentially vacant properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Terminal Capitalization Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)								0.0700
Vacant properties
Fair Value Measurement Inputs and Valuation Techniques
Impairment charges — real estate						$ 6,500	$ 7,900
Spinoff Properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques
Impairment Charges					$ 47,300
Spinoff Properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Minimum
Fair Value Measurement Inputs and Valuation Techniques
Market rent (usd per sqft) \| $ / ft²					6
Spinoff Properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Maximum
Fair Value Measurement Inputs and Valuation Techniques
Market rent (usd per sqft) \| $ / ft²					65
Spinoff Properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Cashflow Discount Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)					0.065
Spinoff Properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Cashflow Discount Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)					0.120
Spinoff Properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Terminal Capitalization Rate \| Minimum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)					0.055
Spinoff Properties \| Real estate and intangibles \| Level 3 \| Fair Value, Measurements, Nonrecurring \| Measurement Input, Terminal Capitalization Rate \| Maximum
Fair Value Measurement Inputs and Valuation Techniques
Real estate measurement input (percent)					0.120