SEGMENT INFORMATION - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues
Rental income	$ 377,432	$ 374,245
Income from loans and investments	4,324	1,289
Interest and other income	3,078	6,780
Revenues	1,358,074	1,199,914
Less:
Interest and other income	3,078	6,780
Property-level operating expenses	783,884	687,497
NOI	569,287	503,884
Interest and other income	3,078	6,780
Interest expense	(149,356)	(149,933)
Depreciation and amortization	(321,525)	(300,255)
General, administrative and professional fees	(53,149)	(48,737)
Loss on extinguishment of debt, net	0	(252)
Transaction, transition and restructuring costs	(5,982)	(4,677)
Recovery of allowance on loans receivable and investments, net		68
Shareholder relations matters	0	(15,714)
Other expense	(1,412)	1,334
Loss from unconsolidated entities	(3,311)	(8,383)
Gain on real estate dispositions	169	341
Income tax benefit	10,557	3,004
Net income (loss)	48,356	(12,540)
Net income attributable to noncontrolling interests	1,488	1,772
Net income attributable to common stockholders	46,868	(14,312)
Cost, Direct Labor	392,624	344,706
Management Fee Expense	50,611	42,066
Segment Reporting, Other Segment Item, Amount	340,649	300,725
Resident fees and services
Revenues
Other revenues	968,904	813,304
Third-party capital management expenses
Revenues
Other revenues	4,336	4,296
Less:
Third-party capital management expenses	1,825	1,753
Operating Segments | SHOP
Revenues
Rental income	0	0
Income from loans and investments	0	0
Interest and other income	0	0
Revenues	968,904	813,304
Less:
Interest and other income	0	0
NOI		203,483
Interest and other income	0	0
Operating Segments | SHOP | Resident fees and services
Revenues
Other revenues	968,904	813,304
Operating Segments | SHOP | Third-party capital management expenses
Revenues
Other revenues	0	0
Less:
Third-party capital management expenses	0	0
Operating Segments | OM&R
Revenues
Rental income	221,319	218,877
Income from loans and investments	0	0
Interest and other income	0	0
Revenues	221,999	219,508
Less:
Interest and other income	0	0
Property-level operating expenses	75,957	73,938
NOI	146,042	145,570
Interest and other income	0	0
Cost, Direct Labor	0	0
Management Fee Expense	0	0
Segment Reporting, Other Segment Item, Amount	75,957	73,938
Operating Segments | OM&R | Resident fees and services
Revenues
Other revenues	0	0
Operating Segments | OM&R | Third-party capital management expenses
Revenues
Other revenues	680	631
Less:
Third-party capital management expenses	0	0
Operating Segments | NNN
Revenues
Rental income	156,113	155,368
Income from loans and investments	0	0
Interest and other income	0	0
Revenues	156,113	155,368
Less:
Interest and other income	0	0
Property-level operating expenses	3,527	3,738
NOI	152,586	151,630
Interest and other income	0	0
Cost, Direct Labor	0	0
Management Fee Expense	0	0
Segment Reporting, Other Segment Item, Amount	3,527	3,738
Operating Segments | NNN | Resident fees and services
Revenues
Other revenues	0	0
Operating Segments | NNN | Third-party capital management expenses
Revenues
Other revenues	0	0
Less:
Third-party capital management expenses	0	0
Operating Segments | Senior Living Operations
Less:
Property-level operating expenses	704,400	609,821
NOI	264,504
Cost, Direct Labor	392,624	344,706
Management Fee Expense	50,611	42,066
Segment Reporting, Other Segment Item, Amount	261,165	223,049
Non-Segment
Revenues
Rental income	0	0
Income from loans and investments	4,324	1,289
Interest and other income	3,078	6,780
Revenues	11,058	11,734
Less:
Interest and other income	3,078	6,780
Property-level operating expenses	0	0
NOI	6,155	3,201
Interest and other income	3,078	6,780
Cost, Direct Labor	0	0
Management Fee Expense	0	0
Segment Reporting, Other Segment Item, Amount	0	0
Non-Segment | Resident fees and services
Revenues
Other revenues	0	0
Non-Segment | Third-party capital management expenses
Revenues
Other revenues	3,656	3,665
Less:
Third-party capital management expenses	$ 1,825	$ 1,753