DESCRIPTION OF BUSINESS - Schedule of Reportable Business Segments and Non-Segment Assets (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) property	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segment property	Jun. 30, 2023 USD ($)
Real estate properties
NOI | $	$ 514,354	$ 481,072	$ 1,018,238	$ 946,937
Percentage of Total NOI			100.00%
Number of real estate properties | property	1,318		1,318
Number of Reportable Segments | segment			3
Operating Segments | Senior housing operating portfolio (SHOP)
Real estate properties
Number of real estate properties | property	582		582
Operating Segments | Outpatient Medical and Research Portfolio
Real estate properties
Number of real estate properties | property	428		428
Operating Segments | Triple-Net Leased Properties
Real estate properties
Number of real estate properties | property	308		308
Operating Segments | Senior housing operating portfolio (SHOP)
Real estate properties
NOI | $	$ 214,241
Operating Segments | Outpatient Medical and Research Portfolio
Real estate properties
NOI | $	146,273	144,195	$ 291,842	280,914
Operating Segments | Triple-Net Leased Properties
Real estate properties
NOI | $	150,428	150,818	302,058	296,761
Non-Segment
Real estate properties
NOI | $	$ 3,412	$ 8,555	$ 6,614	$ 23,987
Non-Segment | Non-Segment
Real estate properties
Percentage of Total NOI			0.60%
Number of real estate properties | property	0		0