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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount of decrease in line of credit facility from forgiveness by the holder of the line of credit.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term loans payable classified as other.

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The fair value, as of the date of each statement of financial position presented, of real estate which is owned but transferred to serve as collateral for the payment of the related debt obligation, and that is reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge it.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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BORROWING ARRANGEMENTS (Schedule of Borrowings) (Details) $ in Thousands, £ in Millions			1 Months Ended	12 Months Ended
	May 24, 2017 USD ($)	Apr. 05, 2017 USD ($)	May 25, 2017 GBP (£)	Dec. 31, 2019 USD ($)	Sep. 20, 2019 USD ($)	Dec. 31, 2018 USD ($)	May 25, 2017 USD ($)	Apr. 04, 2017 USD ($)	Jul. 12, 2016 USD ($)	Dec. 16, 2015 USD ($)	Sep. 23, 2015 USD ($)	Mar. 18, 2015 USD ($)	Sep. 11, 2014 USD ($)	Mar. 11, 2014 USD ($)
Debt Instrument [Line Items]
Total secured borrowings - net				$ 389,680
Revolving line of credit				125,000		$ 313,000
Total term loans - net				804,738		898,726
Total senior notes and other unsecured borrowings - net				3,816,722		3,328,896
Total secured and unsecured borrowings - net				5,136,140		$ 4,540,622
Hud Mortgage Assumed [Member]
Debt Instrument [Line Items]
Assets pleadged as collateral, fair value				$ 617,200
Tranche A One Term Loan Member
Debt Instrument [Line Items]
Term loan/facility terminated	$ 200,000
Tranche A Two Term Loan Member
Debt Instrument [Line Items]
Term loan/facility terminated		$ 200,000
Tranche A Three Term Loan Member
Debt Instrument [Line Items]
Term loan/facility terminated	$ 350,000
Amended 2015 Term Loan Facility
Debt Instrument [Line Items]
Long-term debt, gross							$ 150,000
4.375% notes due 2023
Debt Instrument [Line Items]
Rate				4.375%		4.375%
4.95% notes due 2024
Debt Instrument [Line Items]
Rate				4.95%		4.95%
4.50% notes due 2025
Debt Instrument [Line Items]
Rate				4.50%		4.50%
5.25% notes due 2026
Debt Instrument [Line Items]
Rate				5.25%		5.25%
4.50% notes due 2027
Debt Instrument [Line Items]
Rate				4.50%		4.50%
4.75% notes due 2028
Debt Instrument [Line Items]
Rate				4.75%		4.75%
3.625% notes due 2029
Debt Instrument [Line Items]
Rate				3.625%
Secured Debt [Member]
Debt Instrument [Line Items]
Total secured borrowings - net				$ 389,680
Secured Debt [Member] \| Hud Mortgage Assumed [Member]
Debt Instrument [Line Items]
Rate				3.01%
Total secured borrowings - net				$ 387,405
Secured Debt [Member] \| Term Loan
Debt Instrument [Line Items]
Maturity				2021
Rate				5.00%
Total secured borrowings - net				$ 2,275
Secured Debt [Member] \| 2017 Omega OP Term Loan Facility
Debt Instrument [Line Items]
Total term loans - net				75,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Deferred financing costs - net				(23,778)		$ (22,581)
Total term loans - net				804,738		898,726
Discount - net				(23,041)		(18,523)
Total unsecured borrowings - net				$ 4,746,460		4,540,622
Unsecured Debt [Member] \| Revolving Credit Facility
Debt Instrument [Line Items]
Maturity				2021
Rate				2.99%
Revolving line of credit				$ 125,000		313,000
Unsecured Debt [Member] \| Term Loan
Debt Instrument [Line Items]
Deferred financing costs - net				$ (2,742)		(4,264)
Unsecured Debt [Member] \| U.S. term loan
Debt Instrument [Line Items]
Maturity				2022
Rate				3.25%
Total term loans - net				$ 350,000		425,000	425,000
Unsecured Debt [Member] \| Sterling term loan
Debt Instrument [Line Items]
Maturity				2022
Rate				2.16%
Total term loans - net			£ 100	$ 132,480		127,990
Unsecured Debt [Member] \| 2017 Omega OP Term Loan Facility
Debt Instrument [Line Items]
Maturity				2022
Rate				3.29%
Total term loans - net				$ 75,000		100,000	100,000
Unsecured Debt [Member] \| Amended 2015 Term Loan Facility
Debt Instrument [Line Items]
Maturity				2022
Rate				3.80%
Total term loans - net				$ 250,000		250,000	$ 250,000			$ 250,000
Unsecured Debt [Member] \| Senior Notes And Other Unsecured Borrowings Net [Member]
Debt Instrument [Line Items]
Total senior notes and other unsecured borrowings - net				$ 3,816,722		3,328,896
Unsecured Debt [Member] \| Subordinated debt
Debt Instrument [Line Items]
Maturity				2021
Rate				9.00%
Long-term debt, gross				$ 13,541		20,000
Senior Notes [Member] \| 4.375% notes due 2023
Debt Instrument [Line Items]
Maturity				2023
Rate				4.375%					4.375%
Long-term debt, gross				$ 700,000		700,000			$ 700,000
Senior Notes [Member] \| 4.95% notes due 2024
Debt Instrument [Line Items]
Maturity				2024
Rate				4.95%										4.95%
Long-term debt, gross				$ 400,000		400,000								$ 400,000
Senior Notes [Member] \| 4.50% notes due 2025
Debt Instrument [Line Items]
Maturity				2025
Rate				4.50%									4.50%
Long-term debt, gross				$ 400,000		400,000		$ 150,000					$ 250,000
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		600,000					$ 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		700,000						$ 700,000
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		550,000		$ 550,000
Senior Notes [Member] \| 3.625% notes due 2029
Debt Instrument [Line Items]
Maturity				2029
Rate				3.625%	3.625%
Long-term debt, gross				$ 500,000	$ 500,000
Omega OP
Debt Instrument [Line Items]
Deferred financing costs - net				(200)
Total secured borrowings - net				389,680
Total term loans - net				$ 74,763		$ 99,553
Minimum \| Secured Debt [Member] \| Hud Mortgage Assumed [Member]
Debt Instrument [Line Items]
Maturity				2046
Minimum \| Unsecured Debt [Member] \| U.S. term loan
Debt Instrument [Line Items]
Basis spread on variable rate			0.90%
Minimum \| Unsecured Debt [Member] \| Sterling term loan
Debt Instrument [Line Items]
Basis spread on variable rate			0.90%
Minimum \| Unsecured Debt [Member] \| 2017 Omega OP Term Loan Facility
Debt Instrument [Line Items]
Basis spread on variable rate			0.90%
Minimum \| Unsecured Debt [Member] \| Amended 2015 Term Loan Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.40%
Maximum \| Secured Debt [Member] \| Hud Mortgage Assumed [Member]
Debt Instrument [Line Items]
Maturity				2052
Maximum \| Unsecured Debt [Member] \| U.S. term loan
Debt Instrument [Line Items]
Basis spread on variable rate			1.90%
Maximum \| Unsecured Debt [Member] \| Sterling term loan
Debt Instrument [Line Items]
Basis spread on variable rate			1.90%
Maximum \| Unsecured Debt [Member] \| 2017 Omega OP Term Loan Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.90%
Maximum \| Unsecured Debt [Member] \| Amended 2015 Term Loan Facility
Debt Instrument [Line Items]
Basis spread on variable rate			2.35%