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CONCENTRATION OF CREDIT RISK - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2024 USD ($) property renewalOption state province $ / shares shares	Mar. 31, 2024 USD ($)	Jun. 30, 2023	Jun. 30, 2024 USD ($) property renewalOption state province $ / shares shares	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) shares	Jan. 01, 2022	Jul. 31, 2020 USD ($) shares
Concentration Risk
Number of real estate properties	1,318			1,318
Cash and cash equivalents \| $	$ 557,082			$ 557,082		$ 508,794
Non-mortgage loans receivable, net \| $	29,347			29,347		$ 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%
Operating lease, fair market rent increase, percent, maximum							10.00%
Issuance of common stock, net \| $	$ 6,100			$ 491,797	$ 25,007
Fair value adjustment, net realized (income) expense \| $		$ 1,000
Common stock, shares issued (in shares) \| shares	413,154			413,154		402,380
Outpatient Medical and Research Portfolio \| Operating Segments
Concentration Risk
Number of real estate properties	428			428
Triple-Net Leased Properties \| Operating Segments
Concentration Risk
Number of real estate properties	308			308
Senior housing operating portfolio (SHOP) \| Operating Segments
Concentration Risk
Number of real estate properties	582			582
Triple-Net Leased Properties \| LTAC \| Kindred
Concentration Risk
Number of real estate properties	29			29
Triple-Net Leased Properties \| LTAC \| Kindred \| Group 1
Concentration Risk
Number of real estate properties	6			6
Real estate properties, renewal term	5 years			5 years
Real estate properties, number of renewal extensions \| renewalOption	2			2
Triple-Net Leased Properties \| LTAC \| Kindred \| Group 2
Concentration Risk
Number of real estate properties	23			23
Real estate properties, renewal term	5 years			5 years
Real estate properties, number of renewal extensions \| renewalOption	3			3
Triple-Net Leased Properties \| LTAC \| Brookdale
Concentration Risk
Number of real estate properties	121			121
Triple-Net Leased Properties \| LTAC \| Ardent
Concentration Risk
Number of real estate properties	11			11
Real estate properties, renewal term	10 years			10 years
Real estate properties, number of renewal extensions \| renewalOption	1			1
SHOP \| LTAC \| Brookdale
Concentration Risk
Number of real estate properties	10			10
Real estate properties, renewal term	10 years			10 years
Real estate properties, number of renewal extensions \| renewalOption	2			2
Outpatient Medical and Research Portfolio \| LTAC \| Ardent
Concentration Risk
Number of real estate properties	19			19
Atria \| SHOP
Concentration Risk
Number of independent third party managed properties	205			205
Sunrise \| SHOP
Concentration Risk
Number of independent third party managed properties	93			93
Brookdale
Concentration Risk
Lessor, operating lease, payment to be received, remainder of fiscal year \| $	$ 110,300			$ 110,300
Annual rent \| $	$ 148,900			$ 148,900
Cash and cash equivalents \| $								$ 162,000
Non-mortgage loans receivable, net \| $								45,000
Stock warrants \| $								$ 28,000
Warrants exercisable (in shares) \| shares	14,600			14,600				16,300
Number of securities called by warrants (in shares) \| shares	1,700			1,700
Warrants, exercise price (usd per share) \| $ / shares	$ 3.00			$ 3.00
Brookdale \| Up-front Payment Arrangement
Concentration Risk
Up-front consideration received \| $	$ 64,000			$ 64,000				$ 235,000
Up-front consideration recognized \| $	$ 170,600
Holiday Retirement \| SHOP
Concentration Risk
Number of independent third party managed properties	57			57
Atria and Sunrise \| SHOP
Concentration Risk
Number of independent third party managed properties	298			298
Customer Concentration Risk \| Net Operating Income Benchmark \| Outpatient Medical and Research Portfolio \| Operating Segments
Concentration Risk
Concentration percentage	28.40%			28.70%
Customer Concentration Risk \| Net Operating Income Benchmark \| Triple-Net Leased Properties \| Operating Segments
Concentration Risk
Concentration percentage	29.20%			29.70%
Customer Concentration Risk \| Net Operating Income Benchmark \| Senior housing operating portfolio (SHOP) \| Operating Segments
Concentration Risk
Concentration percentage	41.70%			41.00%
Customer Concentration Risk \| Net Operating Income Benchmark \| Atria
Concentration Risk
Concentration percentage				19.20%
Customer Concentration Risk \| Net Operating Income Benchmark \| Sunrise
Concentration Risk
Concentration percentage				5.90%
Customer Concentration Risk \| Net Operating Income Benchmark \| Brookdale
Concentration Risk
Concentration percentage				7.20%
Customer Concentration Risk \| Net Operating Income Benchmark \| Ardent
Concentration Risk
Concentration percentage				6.60%
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	7.20%		7.80%
Customer Concentration Risk \| Net Operating Income \| Ardent
Concentration Risk
Concentration percentage	6.60%		6.90%
Customer Concentration Risk \| Net Operating Income \| Kindred
Concentration Risk
Concentration percentage	6.60%		6.90%
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			47
Number of states accounting for more than 10% of total revenues and net operating income \| state	1			1
Continuing revenues and NOI threshold				10.00%
Geographic Concentration Risk \| CANADA
Concentration Risk
Number of Canadian provinces in which entity operates \| province	7			7