Real Property Acquisitions and Development - Estimated Fair Value of Allocated Purchase Price of Asset and Liabilities (Details) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Land and land improvements	$ 265,580	$ 358,155
Buildings and improvements	2,238,831	2,319,285
Acquired lease intangibles	143,027	159,772
Construction in progress	108,141	0
Right of use assets, net	4,021	77,455
Total net real estate assets	2,759,600	2,914,667
Receivables and other assets	10,870	9,575
Total assets acquired	2,770,470	2,924,242
Secured debt	(219,067)	0
Lease liabilities	(3,852)	(138,126)
Accrued expenses and other liabilities	(112,667)	(29,717)
Total liabilities acquired	(335,586)	(167,843)
Noncontrolling interests	(116,091)	(21,193)
Non-cash acquisition related activity	(25,795)	0
Cash disbursed for acquisitions	2,292,998	2,735,206
Construction in progress additions	482,551	280,371
Less: Capitalized interest	(20,729)	(14,027)
Accruals	1,643	(3,019)
Cash disbursed for construction in progress	463,465	263,325
Capital improvements to existing properties	315,835	165,691
Total cash invested in real property, net of cash acquired	3,072,298	3,164,222
Cash acquired from acquisition	$ 6,431	301
New issues (in shares)	1,227,000
Seniors Housing Operating
Business Acquisition [Line Items]
Land and land improvements	$ 199,892	264,706
Buildings and improvements	1,988,999	1,655,067
Acquired lease intangibles	109,049	142,439
Construction in progress	108,141	0
Right of use assets, net	169	77,455
Total net real estate assets	2,406,250	2,139,667
Receivables and other assets	10,410	6,041
Total assets acquired	2,416,660	2,145,708
Secured debt	(219,067)	0
Lease liabilities	0	(138,126)
Accrued expenses and other liabilities	(111,373)	(20,748)
Total liabilities acquired	(330,440)	(158,874)
Noncontrolling interests	(115,112)	(2,597)
Non-cash acquisition related activity	(25,795)	0
Cash disbursed for acquisitions	1,945,313	1,984,237
Construction in progress additions	343,000	190,672
Less: Capitalized interest	(16,464)	(9,658)
Accruals	(2,809)	38
Cash disbursed for construction in progress	323,727	181,052
Capital improvements to existing properties	232,618	115,115
Total cash invested in real property, net of cash acquired	2,501,658	2,280,404
Triple-net
Business Acquisition [Line Items]
Land and land improvements	0	48,099
Buildings and improvements	172	436,828
Acquired lease intangibles	0	0
Construction in progress	0	0
Right of use assets, net	0	0
Total net real estate assets	172	484,927
Receivables and other assets	0	0
Total assets acquired	172	484,927
Secured debt	0	0
Lease liabilities	0	0
Accrued expenses and other liabilities	0	(8,703)
Total liabilities acquired	0	(8,703)
Noncontrolling interests	(4)	(2,056)
Non-cash acquisition related activity	0	0
Cash disbursed for acquisitions	168	474,168
Construction in progress additions	64,091	60,251
Less: Capitalized interest	(3,088)	(2,092)
Accruals	0	0
Cash disbursed for construction in progress	61,003	58,159
Capital improvements to existing properties	39,526	26,496
Total cash invested in real property, net of cash acquired	100,697	558,823
Outpatient Medical
Business Acquisition [Line Items]
Land and land improvements	65,688	45,350
Buildings and improvements	249,660	227,390
Acquired lease intangibles	33,978	17,333
Construction in progress	0	0
Right of use assets, net	3,852	0
Total net real estate assets	353,178	290,073
Receivables and other assets	460	3,534
Total assets acquired	353,638	293,607
Secured debt	0	0
Lease liabilities	(3,852)	0
Accrued expenses and other liabilities	(1,294)	(266)
Total liabilities acquired	(5,146)	(266)
Noncontrolling interests	(975)	(16,540)
Non-cash acquisition related activity	0	0
Cash disbursed for acquisitions	347,517	276,801
Construction in progress additions	75,460	29,448
Less: Capitalized interest	(1,177)	(2,277)
Accruals	4,452	(3,057)
Cash disbursed for construction in progress	78,735	24,114
Capital improvements to existing properties	43,691	24,080
Total cash invested in real property, net of cash acquired	$ 469,943	$ 324,995