Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) segment	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Total revenue	$ 812,944	$ 777,541	$ 1,626,808	$ 1,560,372
Total facility operating expenses	562,317	537,507	1,119,304	1,080,057
Total segment operating income	215,920	204,818	439,007	409,127
General and administrative expense (including non-cash stock-based compensation expense)	54,973	46,664	102,847	92,396
Facility operating lease expense:	52,653	50,964	105,527	102,460
Depreciation and amortization:	92,853	88,028	183,829	174,155
Asset impairment:	577	0	2,364	1,708
Loss (gain) on sale of communities, net	(43)	0	(43)	0
Income (loss) from operations	14,907	19,162	44,483	38,408
Interest expense:	63,081	61,567	128,112	119,254
Capital expenditures:	58,141	53,591	101,290	104,649
Total assets	6,141,466		6,141,466		$ 6,335,562
Goodwill	27,321		27,321		27,321
Independent Living
Segment Reporting Information [Line Items]
Goodwill	27,300		27,300		27,300
Operating Segments | Independent Living
Segment Reporting Information [Line Items]
Total revenue	158,135	149,542	315,252	298,490
Community labor expenses:	60,114	56,627	118,398	113,767
Other facility operating expenses	44,423	42,581	89,024	85,746
Total segment operating income	53,598	50,334	107,830	98,977
Facility operating lease expense:	9,692	9,346	19,423	18,777
Depreciation and amortization:	26,494	22,861	52,331	44,904
Interest expense:	15,614	16,179	31,202	32,365
Capital expenditures:	12,571	12,251	22,841	24,971
Total assets	1,210,872		1,210,872		1,252,736
Operating Segments | Assisted Living and Memory Care
Segment Reporting Information [Line Items]
Total revenue	531,318	507,191	1,064,697	1,018,063
Community labor expenses:	259,234	245,099	511,944	491,673
Other facility operating expenses	129,377	125,937	260,493	252,777
Total segment operating income	142,707	136,155	292,260	273,613
Facility operating lease expense:	39,424	37,787	79,006	75,695
Depreciation and amortization:	52,855	49,956	104,495	98,979
Asset impairment:	377	0	1,764	1,708
Interest expense:	37,181	36,376	74,852	72,378
Capital expenditures:	32,134	33,192	58,660	64,240
Total assets	3,904,546		3,904,546		3,983,311
Operating Segments | CCRCs
Segment Reporting Information [Line Items]
Total revenue	86,161	82,976	173,119	167,397
Community labor expenses:	46,231	45,529	92,524	91,583
Other facility operating expenses	22,938	21,734	46,921	44,511
Total segment operating income	16,992	15,713	33,674	31,303
Facility operating lease expense:	3,248	3,090	6,520	6,215
Depreciation and amortization:	8,831	8,889	17,563	17,726
Asset impairment:	200	0	600	0
Interest expense:	5,012	5,955	10,369	11,759
Capital expenditures:	4,844	4,815	8,306	9,348
Total assets	629,304		629,304		640,720
Operating Segments | Corporate and All Other
Segment Reporting Information [Line Items]
Total revenue	37,330	37,832	73,740	76,422
Total segment operating income	2,623	2,616	5,243	5,234
Facility operating lease expense:	289	741	578	1,773
Depreciation and amortization:	4,673	6,322	9,440	12,546
Interest expense:	5,274	3,057	11,689	2,752
Capital expenditures:	8,592	$ 3,333	11,483	$ 6,090
Total assets	$ 396,744		$ 396,744		$ 458,795