FINANCIAL INSTRUMENTS (Schedule of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
4.375% notes due 2023
Liabilities:
Notes issued, interest rate	4.375%	4.375%
4.950% notes due 2024
Liabilities:
Notes issued, interest rate	4.95%	4.95%
4.50% notes due 2025
Liabilities:
Notes issued, interest rate	4.50%	4.50%
5.25% notes due 2026
Liabilities:
Notes issued, interest rate	5.25%	5.25%
4.50% notes due 2027
Liabilities:
Notes issued, interest rate	4.50%	4.50%
4.75% notes due 2028
Liabilities:
Notes issued, interest rate	4.75%	4.75%
3.625% notes due 2029
Liabilities:
Notes issued, interest rate	3.625%	3.625%
3.375% notes due 2031
Liabilities:
Notes issued, interest rate	3.375%	3.375%
3.25% notes due 2033
Liabilities:
Notes issued, interest rate	3.25%
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Assets:
Investments in direct financing leases - net	$ 10,873	$ 10,764
Mortgage notes receivable - net	835,086	885,313
Other investments - net	469,884	467,442
Total	1,315,843	1,363,519
Liabilities:
Term loan	2,275	2,275
Sterling term loan	0	136,453
Subordinated debt - net		20,083
Total	5,253,536	5,169,252
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Omega OP Term Loan Facility
Liabilities:
Omega OP term loan	49,661
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 2017 Omega Op Term Loan [Member]
Liabilities:
Omega OP term loan		49,896
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 4.375% notes due 2023
Liabilities:
Notes Payable	349,100	696,981
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 4.950% notes due 2024
Liabilities:
Notes Payable	397,725	396,714
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 4.50% notes due 2025
Liabilities:
Notes Payable	397,685	396,924
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 5.25% notes due 2026
Liabilities:
Notes Payable	597,142	596,437
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 4.50% notes due 2027
Liabilities:
Notes Payable	692,374	690,909
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 4.75% notes due 2028
Liabilities:
Notes Payable	543,908	542,899
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 3.625% notes due 2029
Liabilities:
Notes Payable	490,681	489,472
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 3.375% notes due 2031
Liabilities:
Notes Payable	683,592	681,802
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 3.25% notes due 2033
Liabilities:
Notes Payable	689,587
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Hud Mortgage
Liabilities:
HUD debt - net	359,806	367,249
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| 2017 Revolving Credit Facility Replaced [Member]
Liabilities:
Revolving line of credit		101,158
Estimate Of Fair Value, Fair Value Disclosure [Member]
Assets:
Investments in direct financing leases - net	10,873	10,764
Mortgage notes receivable - net	869,715	924,353
Other investments - net	476,664	474,552
Total	1,357,252	1,409,669
Liabilities:
Term loan	2,275	2,275
Sterling term loan	0	136,700
Subordinated debt - net		21,599
Total	5,615,593	5,767,243
Estimate Of Fair Value, Fair Value Disclosure [Member] \| Omega OP Term Loan Facility
Liabilities:
Omega OP term loan	50,000
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 2017 Omega Op Term Loan [Member]
Liabilities:
Omega OP term loan		50,000
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 4.375% notes due 2023
Liabilities:
Notes Payable	365,243	770,635
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 4.950% notes due 2024
Liabilities:
Notes Payable	427,184	441,194
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 4.50% notes due 2025
Liabilities:
Notes Payable	427,440	444,652
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 5.25% notes due 2026
Liabilities:
Notes Payable	667,524	697,993
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 4.50% notes due 2027
Liabilities:
Notes Payable	766,003	794,294
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 4.75% notes due 2028
Liabilities:
Notes Payable	607,249	633,950
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 3.625% notes due 2029
Liabilities:
Notes Payable	519,430	532,248
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 3.375% notes due 2031
Liabilities:
Notes Payable	705,810	731,541
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 3.25% notes due 2033
Liabilities:
Notes Payable	683,151
Estimate Of Fair Value, Fair Value Disclosure [Member] \| Hud Mortgage
Liabilities:
HUD debt - net	$ 394,284	409,004
Estimate Of Fair Value, Fair Value Disclosure [Member] \| 2017 Revolving Credit Facility Replaced [Member]
Liabilities:
Revolving line of credit		$ 101,158

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Mortgage loans on real estate fair value disclosure.

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Represents Omega OP term loan fair value.

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Secured borrowings fair value disclosure.

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Represents the fair value of Sterling Term Loan.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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- Definition

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

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value of financial and nonfinancial obligations.

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Fair value portion of notes payable.

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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