SEGMENT INFORMATION - Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information
Total capital expenditures	$ 418,111	$ 88,482
Operating Segments | Triple-Net Leased Properties
Segment Reporting Information
Total capital expenditures	634	8,218
Operating Segments | Senior Living Operations
Segment Reporting Information
Total capital expenditures	143,403	48,717
Operating Segments | Office Operations
Segment Reporting Information
Total capital expenditures	$ 274,074	$ 31,547