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CONCENTRATION OF CREDIT RISK - Narrative (Details) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) property state province renewalOption $ / shares	Mar. 31, 2023	Dec. 31, 2023 USD ($)	Jan. 01, 2022	Jul. 31, 2020 USD ($) shares
Concentration Risk
Number of real estate properties	1,340
Cash and cash equivalents \| $	$ 632,443		$ 508,794
Non-mortgage loans receivable, net \| $	$ 29,365		$ 26,152
Operating lease, lease income, lease payments, annual increase				3.00%
Operating lease, lease income, lease payments, full year's base rent				103.00%
Outpatient Medical and Research Portfolio \| Operating Segments
Concentration Risk
Number of real estate properties	429
Triple-Net Leased Properties \| Operating Segments
Concentration Risk
Number of real estate properties	330
Senior housing operating portfolio (SHOP) \| Operating Segments
Concentration Risk
Number of real estate properties	581
Triple-Net Leased Properties \| LTAC \| Kindred
Concentration Risk
Number of real estate properties	29
Triple-Net Leased Properties \| LTAC \| Kindred \| Group 1
Concentration Risk
Number of real estate properties	6
Real estate properties, number of renewal extensions \| renewalOption	2
Real estate properties, renewal term	5 years
Triple-Net Leased Properties \| LTAC \| Kindred \| Group 2
Concentration Risk
Number of real estate properties	23
Real estate properties, number of renewal extensions \| renewalOption	3
Real estate properties, renewal term	5 years
Triple-Net Leased Properties \| LTAC \| Brookdale
Concentration Risk
Number of real estate properties	121
Triple-Net Leased Properties \| LTAC \| Ardent
Concentration Risk
Number of real estate properties	11
SHOP \| LTAC \| Brookdale
Concentration Risk
Number of real estate properties	10
Real estate properties, number of renewal extensions \| renewalOption	2
Real estate properties, renewal term	10 years
Outpatient Medical and Research Portfolio \| LTAC \| Ardent
Concentration Risk
Number of real estate properties	19
Atria \| SHOP
Concentration Risk
Number of independent third party managed properties	216
Sunrise \| SHOP
Concentration Risk
Number of independent third party managed properties	86
Brookdale
Concentration Risk
Lessor, operating lease, payment to be received, remainder of fiscal year \| $	$ 110,300
Annual rent \| $	$ 148,900
Cash and cash equivalents \| $					$ 162,000
Non-mortgage loans receivable, net \| $					45,000
Stock warrants \| $					$ 28,000
Number of securities called by warrants (in shares) \| shares					16.3
Warrants, exercise price (usd per share) \| $ / shares	$ 3.00
Brookdale \| Up-front Payment Arrangement
Concentration Risk
Up-front consideration received \| $	$ 74,700				$ 235,000
Up-front consideration recognized \| $	$ 160,000
Holiday Retirement \| SHOP
Concentration Risk
Number of independent third party managed properties	67
Atria and Sunrise \| SHOP
Concentration Risk
Number of independent third party managed properties	302
Customer Concentration Risk \| Net Operating Income Benchmark \| Outpatient Medical and Research Portfolio \| Operating Segments
Concentration Risk
Concentration percentage	28.90%
Customer Concentration Risk \| Net Operating Income Benchmark \| Triple-Net Leased Properties \| Operating Segments
Concentration Risk
Concentration percentage	30.10%
Customer Concentration Risk \| Net Operating Income Benchmark \| Senior housing operating portfolio (SHOP) \| Operating Segments
Concentration Risk
Concentration percentage	40.40%
Customer Concentration Risk \| Net Operating Income Benchmark \| Atria
Concentration Risk
Concentration percentage	19.00%
Customer Concentration Risk \| Net Operating Income Benchmark \| Sunrise
Concentration Risk
Concentration percentage	6.10%
Customer Concentration Risk \| Net Operating Income Benchmark \| Brookdale
Concentration Risk
Concentration percentage	7.40%
Customer Concentration Risk \| Net Operating Income Benchmark \| Ardent
Concentration Risk
Concentration percentage	6.70%
Customer Concentration Risk \| Net Operating Income Benchmark \| Kindred
Concentration Risk
Concentration percentage	6.60%
Customer Concentration Risk \| Net Operating Income \| Brookdale
Concentration Risk
Concentration percentage	7.40%	8.00%
Customer Concentration Risk \| Net Operating Income \| Ardent
Concentration Risk
Concentration percentage	6.70%	7.10%
Customer Concentration Risk \| Net Operating Income \| Kindred
Concentration Risk
Concentration percentage	6.60%	7.00%
Customer Concentration Risk \| Net Operating Income \| Kindred \| Group 1
Concentration Risk
Concentration percentage	1.30%
Customer Concentration Risk \| Net Operating Income \| Kindred \| Group 2
Concentration Risk
Concentration percentage	5.30%
Geographic Concentration Risk
Concentration Risk
Number of states in which entity operates \| state	47
Number of states accounting for more than 10% of total revenues and net operating income \| state	1
Continuing revenues and NOI threshold	10.00%
Geographic Concentration Risk \| CANADA
Concentration Risk
Number of Canadian provinces in which entity operates \| province	7