SEGMENT INFORMATION - Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information
Payments for Capital Improvements	$ 110,830	$ 295,942	$ 311,386	$ 380,646
Operating Segments | Triple-Net Leased Properties
Segment Reporting Information
Payments for Capital Improvements	13,483	5,656	21,168	14,247
Operating Segments | Senior Living Operations
Segment Reporting Information
Payments for Capital Improvements	30,932	37,494	82,816	64,453
Operating Segments | Office Operations
Segment Reporting Information
Payments for Capital Improvements	$ 66,415	$ 252,792	$ 207,402	$ 301,946