Loans Receivable - Narrative (Details) $ in Thousands		1 Months Ended				3 Months Ended					9 Months Ended		12 Months Ended
	Mar. 01, 2024 USD ($) loan	Nov. 30, 2024 USD ($) property	Jul. 31, 2024 USD ($) property extension_option	May 31, 2024 USD ($)	Feb. 29, 2024 USD ($)	Sep. 30, 2025 USD ($) property	Jun. 30, 2025 USD ($) property	Sep. 30, 2024 USD ($) property	Jun. 30, 2024 USD ($) property	Mar. 31, 2024 USD ($) property	Sep. 30, 2025 USD ($) loan joint_venture	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) property loan
Loans Receivable:
Loans receivables, acquired	$ 124,000
Financing receivable, after allowance for credit loss						$ 673,502					$ 673,502		$ 717,190
Credit loss reserve on unfunded loan commitments						$ 1,600					1,600		2,900
Sunrise Senior Housing Portfolio
Loans Receivable:
Proceeds from the collection of loans receivable				$ 5,000	$ 69,000
Financing receivable, after allowance for credit loss													58,000
Other SHOP Seller Financing
Loans Receivable:
Financing receivable, after allowance for credit loss													48,000
Outpatient Medical Buildings
Loans Receivable:
Number of properties sold | property			59			2		59		2
Proceeds from sale of property			$ 674,000			$ 27,000		$ 674,000	$ 179,000	$ 29,000
Investments in loans receivable			$ 405,000					405,000
Loans receivable, number of extensions | extension_option			2
Loan receivable, period of extensions			12 months
Proceeds from loan originations			$ 1,000
Mark-to-market discount of real estate													21,000
Noncash or part noncash, interest income						2,000		$ 1,000			5,000	$ 1,000
Unamortized discount						13,000					$ 13,000		$ 18,000
Two Outpatient Medical Buildings
Loans Receivable:
Number of properties sold | property		2											2
Proceeds from sale of property		$ 23,000											$ 23,000
Investments in loans receivable		$ 14,000											14,000
Outpatient medical
Loans Receivable:
Number of joint ventures | joint_venture											2
Land Parcel
Loans Receivable:
Number of properties sold | property							1		11
Proceeds from sale of property							$ 4,000
Other non-reportable | Brookedale MTCA | Lessor Asset Under Operating Lease | CCRC JV
Loans Receivable:
Financing receivable, after allowance for credit loss						67,000					$ 67,000		61,000
Minimum | Outpatient Medical Buildings
Loans Receivable:
Loans receivable, interest rate (as a percent)			0.060
Maximum | Outpatient Medical Buildings
Loans Receivable:
Loans receivable, interest rate (as a percent)			0.065
Secured Mortgage Loans
Loans Receivable:
Number of loans | loan	9
Loans receivable, outstanding balance	$ 89,000
Receivable with imputed interest						300					$ 300		1,000
Secured Mortgage Loans | Other
Loans Receivable:
Number of loans | loan											1
Proceeds from the collection of loans receivable											$ 15,000
Payments for loans receivable											27,000
Secured Mortgage Loans | Lab | Other
Loans Receivable:
Loans receivable, outstanding balance											$ 75,000
Number of secured loans | loan											1
Payments for loans receivable											$ 28,000
Secured Mortgage Loans | Outpatient medical | Other
Loans Receivable:
Loans receivable, outstanding balance											41,000
Payments for loans receivable											4,000
Secured Mortgage Loans | Land Parcel | Other
Loans Receivable:
Payments for loans receivable											4,000
Secured Mortgage Loans | Minimum
Loans Receivable:
Loans receivable, interest rate (as a percent)	0.0700
Secured Mortgage Loans | Maximum
Loans Receivable:
Loans receivable, interest rate (as a percent)	0.1000
Mezzanine loans
Loans Receivable:
Number of loans | loan	10
Loans receivable, outstanding balance	$ 36,000
Receivable with imputed interest						$ 1,000					$ 1,000		$ 2,000
Mezzanine loans | Other
Loans Receivable:
Number of loans | loan											1		1
Loans receivable, outstanding balance											$ 4,000		$ 15,000
Proceeds from the collection of loans receivable											$ 1,000
Number of joint ventures | joint_venture											1
Mezzanine loans | Minimum
Loans Receivable:
Loans receivable, interest rate (as a percent)	0.0800
Mezzanine loans | Maximum
Loans Receivable:
Loans receivable, interest rate (as a percent)	0.1000
Secured Mortgage Loans | Other
Loans Receivable:
Number of loans | loan											1
Proceeds from collection of long-term loans to related parties											$ 3,000
Construction Loan | Other
Loans Receivable:
Number of loans | loan													1
Loans receivable, outstanding balance													$ 36,000
Payments for loans receivable													$ 0