SEGMENT INFORMATION - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenues:
Rental income	$ 352,743	$ 352,101
Income from loans and investments	13,589	9,847
Interest and other income	1,743	536
Total revenues	1,077,245	1,017,554
Less:
Interest and other income	1,743	536
Property-level operating expenses	607,931	542,721
Third party capital management expenses	1,706	1,313
NOI	465,865	472,984
Interest and other income	1,743	536
Interest expense	(128,075)	(110,794)
Depreciation and amortization	(282,119)	(289,064)
General, administrative and professional fees	(44,798)	(42,998)
Transaction expenses and deal costs	(1,386)	(19,992)
Allowance on loans receivable and investments	8,064	54
Other	(7,762)	27,190
Loss from unconsolidated entities	(5,623)	(4,269)
Gain on real estate dispositions	10,201	2,455
Income tax benefit	2,802	4,490
Income from continuing operations	18,912	40,592
Net income	18,912	40,592
Net income attributable to noncontrolling interests	1,395	1,860
Net income attributable to common stockholders	17,517	38,732
Resident fees and services
Revenues:
Other revenues	704,993	651,121
Third party capital management revenues
Revenues:
Other revenues	4,177	3,949
Operating Segments | Triple-Net Leased Properties
Revenues:
Rental income	149,739	151,561
Income from loans and investments	0	0
Interest and other income	0	0
Total revenues	149,739	151,561
Less:
Interest and other income	0	0
Property-level operating expenses	3,796	4,008
Third party capital management expenses	0	0
NOI	145,943	147,553
Interest and other income	0	0
Operating Segments | Triple-Net Leased Properties | Resident fees and services
Revenues:
Other revenues	0	0
Operating Segments | Triple-Net Leased Properties | Third party capital management revenues
Revenues:
Other revenues	0	0
Operating Segments | Office Operations
Revenues:
Rental income	203,004	200,540
Income from loans and investments	0	0
Interest and other income	0	0
Total revenues	203,632	201,157
Less:
Interest and other income	0	0
Property-level operating expenses	66,913	63,183
Third party capital management expenses	0	0
NOI	136,719	137,974
Interest and other income	0	0
Operating Segments | Office Operations | Resident fees and services
Revenues:
Other revenues	0	0
Operating Segments | Office Operations | Third party capital management revenues
Revenues:
Other revenues	628	617
Operating Segments | SHOP
Revenues:
Rental income	0	0
Income from loans and investments	0	0
Interest and other income	0	0
Total revenues	704,993	651,121
Less:
Interest and other income	0	0
Property-level operating expenses	537,222	475,530
Third party capital management expenses	0	0
NOI	167,771	175,591
Interest and other income	0	0
Operating Segments | SHOP | Resident fees and services
Revenues:
Other revenues	704,993	651,121
Operating Segments | SHOP | Third party capital management revenues
Revenues:
Other revenues	0	0
Non-Segment
Revenues:
Rental income	0	0
Income from loans and investments	13,589	9,847
Interest and other income	1,743	536
Total revenues	18,881	13,715
Less:
Interest and other income	1,743	536
Property-level operating expenses	0	0
Third party capital management expenses	1,706	1,313
NOI	15,432	11,866
Interest and other income	1,743	536
Non-Segment | Resident fees and services
Revenues:
Other revenues	0	0
Non-Segment | Third party capital management revenues
Revenues:
Other revenues	$ 3,549	$ 3,332