Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Total revenue	$ 813,165	$ 784,167	$ 2,439,973	$ 2,344,539
Total facility operating expenses	566,985	548,282	1,686,289	1,628,339
Total segment operating income	210,853	198,123	649,860	607,250
General and administrative expense (including non-cash stock-based compensation expense)	50,866	44,929	153,713	137,325
Facility operating lease expense:	51,993	51,937	157,520	154,397
Depreciation and amortization:	94,792	90,064	278,621	264,219
Asset impairment:	62,696	934	65,060	2,642
Loss (gain) on sale of communities, net	(139)	0	(182)	0
Loss (gain) on facility operating lease termination, net	4,480	0	4,480	0
Income (loss) from operations	(53,835)	10,259	(9,352)	48,667
Interest expense:	63,574	66,316	191,686	185,570
Capital expenditures:	47,183	48,623	148,473	153,272
Total assets	6,012,708		6,012,708		$ 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	156,996	150,380	472,248	448,870
Community labor expenses:	60,261	57,706	178,659	171,473
Other facility operating expenses	45,232	43,927	134,256	129,673
Total segment operating income	51,503	48,747	159,333	147,724
Facility operating lease expense:	9,649	9,815	29,072	28,592
Depreciation and amortization:	28,097	23,526	80,427	68,430
Asset impairment:	14,624	233	14,624	233
Interest expense:	15,750	16,301	46,952	48,666
Capital expenditures:	10,599	10,853	33,441	35,824
Total assets	1,165,714		1,165,714		1,252,736
Operating Segments | Assisted Living and Memory Care
Segment Reporting Information [Line Items]
Total revenue	531,941	510,084	1,596,638	1,528,147
Community labor expenses:	260,274	249,091	772,218	740,764
Other facility operating expenses	130,982	129,225	391,475	382,002
Total segment operating income	140,685	131,768	432,945	405,381
Facility operating lease expense:	38,827	38,543	117,834	114,238
Depreciation and amortization:	53,004	51,110	157,500	150,089
Asset impairment:	47,883	701	49,647	2,409
Interest expense:	37,438	36,617	112,290	108,995
Capital expenditures:	28,547	29,158	87,207	93,398
Total assets	3,810,548		3,810,548		3,983,311
Operating Segments | CCRCs
Segment Reporting Information [Line Items]
Total revenue	86,203	83,265	259,322	250,662
Community labor expenses:	46,913	45,639	139,437	137,222
Other facility operating expenses	23,323	22,694	70,244	67,205
Total segment operating income	15,967	14,932	49,641	46,235
Facility operating lease expense:	3,227	3,369	9,748	9,584
Depreciation and amortization:	9,147	8,843	26,710	26,569
Asset impairment:	189	0	789	0
Interest expense:	5,056	5,997	15,425	17,756
Capital expenditures:	3,690	4,402	11,995	13,750
Total assets	631,390		631,390		640,720
Operating Segments | Corporate and All Other
Segment Reporting Information [Line Items]
Total revenue	38,025	40,438	111,765	116,860
Total segment operating income	2,698	2,676	7,941	7,910
Facility operating lease expense:	290	210	866	1,983
Depreciation and amortization:	4,544	6,585	13,984	19,131
Interest expense:	5,330	7,401	17,019	10,153
Capital expenditures:	4,347	$ 4,210	15,830	$ 10,300
Total assets	$ 405,056		$ 405,056		$ 458,795