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BORROWING ACTIVITIES AND ARRANGEMENTS (Schedule of Borrowings) (Details)				1 Months Ended		3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 20, 2025 USD ($)	Apr. 29, 2025 USD ($)	Jan. 15, 2025 USD ($)	Jul. 31, 2025 item	Jun. 30, 2025 USD ($) facility	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) facility item	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Apr. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)
Debt Instrument [Line Items]
Total secured borrowings					$ 260,942,000		$ 260,942,000		$ 243,310,000
Total senior notes and other unsecured borrowings - net					4,739,491,000		4,739,491,000		4,595,549,000
Total secured and unsecured borrowings - net					5,000,433,000		5,000,433,000		4,838,859,000
Real estate assets - net					$ 6,795,148,000		$ 6,795,148,000		$ 6,339,158,000
Loss on extinguishment of debt						$ 213,000		$ 1,496,000
Debt instrument, covenant compliance							As of June 30, 2025 and December 31, 2024, we were in compliance with all applicable covenants for our borrowings		As of June 30, 2025 and December 31, 2024, we were in compliance with all applicable covenants for our borrowings
Number of Facilities | facility					1,056		1,056
Repayments of Long-term Debt							$ 527,240,000	$ 890,128,000
Assisted Living Facilities [Member]
Debt Instrument [Line Items]
Number of Facilities | facility					342		342
4.50% notes due 2025
Debt Instrument [Line Items]
Rate					4.50%		4.50%		4.50%
5.25% notes due 2026
Debt Instrument [Line Items]
Rate					5.25%		5.25%		5.25%
5.20% notes due 2030
Debt Instrument [Line Items]
Rate					5.20%		5.20%
4.50% notes due 2027
Debt Instrument [Line Items]
Rate					4.50%		4.50%		4.50%
4.75% notes due 2028
Debt Instrument [Line Items]
Rate					4.75%		4.75%		4.75%
3.63% notes due 2029
Debt Instrument [Line Items]
Rate					3.63%		3.63%		3.63%
3.38% notes due 2031
Debt Instrument [Line Items]
Rate					3.38%		3.38%		3.38%
3.25% notes due 2033
Debt Instrument [Line Items]
Rate					3.25%		3.25%		3.25%
2025 Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross					$ 428,500,000		$ 428,500,000
Debt instrument extension period duration					12 months
Debt instrument, maturity date					Aug. 08, 2025
Number of Extension Options | item							2
2025 Term Loan [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date				Aug. 08, 2026
Number of Extension Options | item				1
Number of Extension Options Exercised | item				1
Secured Debt [Member]
Debt Instrument [Line Items]
Deferred financing costs - net					$ (2,874,000)		$ (2,874,000)		$ (3,753,000)
Premium - net					12,192,000		12,192,000		15,915,000
Total secured borrowings					$ 260,942,000		$ 260,942,000		243,310,000
Secured Debt [Member] | Mortgage Loan Due 2026 [Member]
Debt Instrument [Line Items]
Maturity							2026
Rate					9.60%		9.60%
Total secured borrowings					$ 251,624,000		$ 251,624,000		231,148,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Deferred financing costs - net					(17,930,000)		(17,930,000)		(14,843,000)
Discount - net					(21,079,000)		(21,079,000)		(18,108,000)
Total senior notes and other unsecured borrowings - net					4,739,491,000		4,739,491,000		4,595,549,000
Total unsecured borrowings - net					4,739,491,000		$ 4,739,491,000		4,595,549,000
Unsecured Debt [Member] | Omega OP Term Loan Facility
Debt Instrument [Line Items]
Maturity							2025
Total term loans - net									50,000,000
Repayments of Long-term Debt		$ 50,000,000
Unsecured Debt [Member] | 2025 Term Loan [Member]
Debt Instrument [Line Items]
Maturity							2025
Long-term debt, gross					$ 428,500,000		$ 428,500,000		428,500,000
Debt instrument, interest rate, effective percentage					5.60%		5.60%
Derivative, Variable Interest Rate					4.047%		4.047%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]							us-gaap:SecuredOvernightFinancingRateSofrMember
Senior Notes [Member] | 4.50% notes due 2025
Debt Instrument [Line Items]
Maturity							2025
Rate			4.50%		4.50%		4.50%
Long-term debt, gross									400,000,000
Repayments of senior debt			$ 400,000,000
Senior Notes [Member] | 5.25% notes due 2026
Debt Instrument [Line Items]
Maturity							2026
Rate					5.25%		5.25%
Long-term debt, gross					$ 600,000,000		$ 600,000,000		600,000,000
Senior Notes [Member] | 5.20% notes due 2030
Debt Instrument [Line Items]
Maturity							2030
Rate	5.20%				5.20%		5.20%
Discount - net	$ (5,300,000)
Long-term debt, gross					$ 600,000,000		$ 600,000,000
Debt instrument, face amount	$ 600,000,000
Debt instrument, maturity date	Jul. 01, 2030
Debt instrument issuance percentage of face value	99.118%
Debt issuance costs, gross	$ 5,600,000
Senior Notes [Member] | 4.50% notes due 2027
Debt Instrument [Line Items]
Maturity							2027
Rate					4.50%		4.50%
Long-term debt, gross					$ 700,000,000		$ 700,000,000		700,000,000
Senior Notes [Member] | 4.75% notes due 2028
Debt Instrument [Line Items]
Maturity							2028
Rate					4.75%		4.75%
Long-term debt, gross					$ 550,000,000		$ 550,000,000		550,000,000
Senior Notes [Member] | 3.63% notes due 2029
Debt Instrument [Line Items]
Maturity							2029
Rate					3.63%		3.63%
Long-term debt, gross					$ 500,000,000		$ 500,000,000		500,000,000
Senior Notes [Member] | 3.38% notes due 2031
Debt Instrument [Line Items]
Maturity							2031
Rate					3.38%		3.38%					3.375%
Long-term debt, gross					$ 700,000,000		$ 700,000,000		700,000,000
Debt instrument, face amount												$ 700,000,000
Senior Notes [Member] | 3.25% notes due 2033
Debt Instrument [Line Items]
Maturity							2033
Rate					3.25%		3.25%				3.25%
Long-term debt, gross					$ 700,000,000		$ 700,000,000		$ 700,000,000
Debt instrument, face amount											$ 700,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility					$ 0		$ 0
Revolving Credit Facility | Unsecured Debt [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 1,450,000,000
Revolving Credit Facility | Unsecured Debt [Member] | United States Dollar Tranche [Member]
Debt Instrument [Line Items]
Rate					5.64%		5.64%
Revolving Credit Facility | Unsecured Debt [Member] | British Pound Sterling Tranche [Member]
Debt Instrument [Line Items]
Rate					5.54%		5.54%
Revolving Credit Facility | Unsecured Debt [Member] | Revolving Credit Facility Due 2025 [Member]
Debt Instrument [Line Items]
Maturity							2025
Rate					5.64%		5.64%
Number of Extension Options							2
Number of Extension Options Exercised							1

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