Segment Reporting - Income Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues:
Total revenues	$ 1,537,853	$ 1,495,427	$ 1,410,308
Less:
Interest expense	204,498	235,239	191,775
Depreciation and amortization	261,923	284,957	284,083
Segment loss	(285,886)	(370,255)	(293,572)
Reconciliation of segment loss:
General and administrative	(45,502)	(26,518)	(26,131)
Acquisition and certain other transaction related costs	(10,356)	(2,510)	(10,853)
Gain (loss) on sale of properties	117,730	(18,938)	1,205
Gains on equity securities, net	0	0	8,126
Interest and other income	5,839	8,950	15,536
Interest expense	(204,498)	(235,239)	(191,775)
Loss on modification or early extinguishment of debt	(42,526)	(324)	(2,468)
Income tax expense	(1,743)	(467)	(445)
Equity in net earnings (losses) of investees	36,760	1,597	(20,461)
Net loss	(285,886)	(370,255)	(293,572)
Rental income
Revenues:
Total revenues	225,198	251,038	258,400
Residents fees and services
Revenues:
Total revenues	1,312,655	1,244,389	1,151,908
Operating Segments
Revenues:
Total revenues	1,506,464	1,457,709	1,372,438
Less:
Senior living labor and benefits	663,431	630,998	603,711
Dietary	83,773	85,620	78,508
Utilities	87,869	84,303	83,198
Real estate taxes	68,688	72,107	73,921
Insurance	37,256	44,066	42,426
Other operating expenses	318,061	318,872	291,291
Interest expense	27,824	5,972	1,000
Depreciation and amortization	252,398	275,024	274,131
Other segment items	125,797	97,222	36,055
Segment loss	(158,633)	(156,475)	(111,803)
Reconciliation of segment loss:
Interest expense	(27,824)	(5,972)	(1,000)
Net loss	(158,633)	(156,475)	(111,803)
Operating Segments | SHOP
Revenues:
Total revenues	1,312,655	1,244,389	1,151,908
Less:
Senior living labor and benefits	663,431	630,998	603,711
Dietary	83,773	85,620	78,508
Utilities	74,742	70,616	69,280
Real estate taxes	45,877	43,624	44,476
Insurance	35,071	41,066	39,572
Other operating expenses	270,505	266,405	239,544
Interest expense	18,728	229	551
Depreciation and amortization	189,985	195,638	175,926
Other segment items	40,543	0	(40)
Segment loss	(110,000)	(89,807)	(99,620)
Reconciliation of segment loss:
Interest and other income	0	0	1,581
Interest expense	(18,728)	(229)	(551)
Net loss	(110,000)	(89,807)	(99,620)
Operating Segments | Medical Office and Life Science Portfolio
Revenues:
Total revenues	193,809	213,320	220,530
Less:
Senior living labor and benefits	0	0	0
Dietary	0	0	0
Utilities	13,127	13,687	13,918
Real estate taxes	22,811	28,483	29,445
Insurance	2,185	3,000	2,854
Other operating expenses	47,556	52,467	51,747
Interest expense	9,096	5,743	449
Depreciation and amortization	62,413	79,386	98,205
Other segment items	85,254	97,222	36,095
Segment loss	(48,633)	(66,668)	(12,183)
Reconciliation of segment loss:
Interest expense	(9,096)	(5,743)	(449)
Net loss	(48,633)	(66,668)	(12,183)
Operating Segments | Rental income
Revenues:
Total revenues	193,809	213,320	220,530
Operating Segments | Rental income | SHOP
Revenues:
Total revenues	0	0	0
Operating Segments | Rental income | Medical Office and Life Science Portfolio
Revenues:
Total revenues	193,809	213,320	220,530
Operating Segments | Residents fees and services
Revenues:
Total revenues	1,312,655	1,244,389	1,151,908
Operating Segments | Residents fees and services | SHOP
Revenues:
Total revenues	1,312,655	1,244,389	1,151,908
Operating Segments | Residents fees and services | Medical Office and Life Science Portfolio
Revenues:
Total revenues	0	0	0
All Other
Revenues:
Total revenues	31,389	37,718	37,870
Less:
Interest expense	176,674	229,267	190,775
Reconciliation of segment loss:
Other income	21,602	27,209	26,822
General and administrative	(45,502)	(26,518)	(26,131)
Acquisition and certain other transaction related costs	(10,356)	(2,510)	(10,853)
Gain (loss) on sale of properties	99,114
Gains on equity securities, net			8,126
Interest and other income	5,839	8,950	13,955
Interest expense	(176,674)	(229,267)	(190,775)
Loss on modification or early extinguishment of debt	(42,526)	(324)	(2,468)
Income tax expense	(1,743)	(467)	$ (445)
Equity in net earnings (losses) of investees	$ 22,993	$ (9,147)