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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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Loans Receivable - Narrative (Details)			1 Months Ended															3 Months Ended			6 Months Ended		12 Months Ended
Loans Receivable - Narrative (Details)	Mar. 01, 2024 USD ($) loan	Dec. 31, 2023 USD ($)	Jul. 31, 2024 USD ($) extension_option property	Jun. 30, 2024 USD ($) loan	May 31, 2024 USD ($) loan	Feb. 29, 2024 USD ($)	Jan. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Jun. 30, 2023	May 31, 2023 USD ($) loan	Apr. 30, 2023 USD ($) loan	Feb. 28, 2023 USD ($) loan	Dec. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Feb. 28, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jan. 31, 2021 USD ($) facility	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($) property	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) loan	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loans Receivable:
Number of loans \| loan																					6
Loans receivables, acquired	$ 124,000,000
Loans and leases receivable, remaining commitments				$ 69,000,000														$ 69,000,000			$ 69,000,000
Loans receivable, net of reserves of $9,143 and $2,830		$ 218,450,000		275,478,000														275,478,000			275,478,000
Gain (loss) on sales of real estate, net																		122,044,000		$ 4,885,000	125,299,000	$ 86,463,000
Credit loss reserve on unfunded loan commitments		700,000		5,300,000														5,300,000			5,300,000
Sunrise Senior Housing Portfolio
Loans Receivable:
Loans and leases receivable, remaining commitments		29,000,000				$ 0
Number of assets to be sold \| facility																	32
Proceeds from sale of property																	$ 664,000,000
Investments in loans receivable																	410,000,000
Capital expenditure funding, amount committed						1,000,000											$ 92,000,000						$ 40,000,000
Capital expenditure funding, cost of capital, percent committed																	65.00%
Proceeds from the collection of loans receivable					$ 5,000,000	$ 69,000,000							$ 10,000,000	$ 27,000,000	$ 8,000,000	$ 246,000,000
Capital expenditure funding, amount funded		11,000,000
Loans receivable, net of reserves of $9,143 and $2,830		131,000,000		58,000,000														58,000,000			58,000,000
Sunrise Senior Housing Portfolio \| Secured Overnight Financing Rate (SOFR)
Loans Receivable:
Loans receivable, conversion of basis spread on variable rate						0.10%			0.10%
Loans receivable, floor rate						9.00%
Sunrise Senior Housing Portfolio \| Secured Overnight Financing Rate (SOFR), First Two Years
Loans Receivable:
Loans receivable, basis spread on variable rate						4.00%
Loan receivable, extended maturity term						2 years
Sunrise Senior Housing Portfolio \| Secured Overnight Financing Rate (SOFR), Last Eighteen Months
Loans Receivable:
Loans receivable, basis spread on variable rate						5.00%
Loan receivable, extended maturity term						18 months
SHOP
Loans Receivable:
Number of assets to be sold \| facility																	16
Proceeds from sale of property																	$ 230,000,000
Investments in loans receivable																	$ 150,000,000
Loans receivable, extension fee												$ 1,000,000
Outpatient Medical Buildings \| Discontinued Operations, Disposed of by Sale
Loans Receivable:
Proceeds from sale of property																			$ 29,000,000
Number of properties sold \| property																			2
Gain (loss) on sales of real estate, net																			$ 3,000,000
Outpatient Medical Buildings \| Discontinued Operations, Disposed of by Sale \| Subsequent Event
Loans Receivable:
Proceeds from sale of property			$ 674,000,000
Number of properties sold \| property			59
Gain (loss) on sales of real estate, net			$ 405,000,000
Loans receivable, number of extensions \| extension_option			2
Loan receivable, period of extensions			12 months
Other Non-Reporting Segment \| Brookedale MTCA \| Lessor Asset Under Operating Lease \| CCRC JV
Loans Receivable:
Loans receivable, net of reserves of $9,143 and $2,830		43,000,000		53,000,000														53,000,000			53,000,000
Minimum \| Outpatient Medical Buildings \| Discontinued Operations, Disposed of by Sale \| Subsequent Event
Loans Receivable:
Loans receivable, interest rate			0.060
Maximum \| Outpatient Medical Buildings \| Discontinued Operations, Disposed of by Sale \| Subsequent Event
Loans Receivable:
Loans receivable, interest rate			0.065
Secured Mortgage Loans
Loans Receivable:
Number of loans \| loan	9
Loans receivable, outstanding balance	$ 89,000,000
Receivable with imputed interest				1,000,000														1,000,000			1,000,000
Secured Mortgage Loans \| Other
Loans Receivable:
Proceeds from the collection of loans receivable								$ 21,000,000		$ 12,000,000	$ 14,000,000	$ 35,000,000
Number of secured loans \| loan										2	1	1
Secured Mortgage Loans \| Other \| During June 2024 to Septmeber 2024
Loans Receivable:
Loans receivable, outstanding balance				$ 12,000,000
Number of secured loans \| loan				1
Secured Mortgage Loans \| Secured Overnight Financing Rate (SOFR) \| Other
Loans Receivable:
Loans receivable, conversion of basis spread on variable rate										0.10%
Secured Mortgage Loans \| LIBOR \| Other
Loans Receivable:
Loans receivable, outstanding balance										$ 21,000,000
Number of secured loans \| loan										1
Secured Mortgage Loans \| SHOP
Loans Receivable:
Proceeds from the collection of loans receivable												$ 102,000,000
Loans receivable, floor rate							12.00%
Loans receivable, net of reserves of $9,143 and $2,830		$ 48,000,000		$ 48,000,000														48,000,000			48,000,000
Loans receivable, extension fee							$ 1,000,000
Secured Mortgage Loans \| SHOP \| Secured Overnight Financing Rate (SOFR)
Loans Receivable:
Loans receivable, conversion of basis spread on variable rate							0.11%
Loans receivable, basis spread on variable rate												0.11%
Loans receivable, floor rate							7.00%
Secured Mortgage Loans \| SHOP \| Secured Overnight Financing Rate (SOFR), First Six Months
Loans Receivable:
Loans receivable, basis spread on variable rate												6.00%
Secured Mortgage Loans \| SHOP \| Secured Overnight Financing Rate (SOFR), Last Six Months
Loans Receivable:
Loans receivable, basis spread on variable rate												7.00%
Secured Mortgage Loans \| Minimum
Loans Receivable:
Loans receivable, interest rate	0.0700
Secured Mortgage Loans \| Maximum
Loans Receivable:
Loans receivable, interest rate	0.1000
Mezzanine Loans
Loans Receivable:
Number of loans \| loan	10
Loans receivable, outstanding balance	$ 36,000,000
Receivable with imputed interest				3,000,000														$ 3,000,000			$ 3,000,000
Mezzanine Loans \| Other \| During May 2026 to May 2027
Loans Receivable:
Loans receivable, outstanding balance					$ 2,000,000
Number of secured loans \| loan					1
Mezzanine Loans \| Other \| During June 2024 to June 2025
Loans Receivable:
Loans receivable, outstanding balance				$ 1,000,000
Number of secured loans \| loan				1
Mezzanine Loans \| Minimum
Loans Receivable:
Loans receivable, interest rate	0.0800
Mezzanine Loans \| Maximum
Loans Receivable:
Loans receivable, interest rate	0.1000