Leases - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Sep. 30, 2024 USD ($) community	Mar. 31, 2025 USD ($) lease community	Mar. 31, 2024 USD ($)
Lessee, Lease, Description [Line Items]
Operating and financing leases, number of communities | community		236
Number of communities leased | lease		227
Financing leases, number of communities | lease		9
Gain (loss) on debt modification and extinguishment, net		$ (35,220)	$ 0
Diversified Healthcare Trust
Lessee, Lease, Description [Line Items]
Number of communities acquired | community	25
Payments to acquire lease	$ 135,000
Annualized cash rent payments	$ 10,200
Welltower Inc.
Lessee, Lease, Description [Line Items]
Number of communities acquired | community	5
Payments to acquire lease	$ 175,000
Annualized cash rent payments	$ 13,700
Number of communities accounted for as failed sale-leaseback transaction | community	3
Gain (loss) on debt modification and extinguishment, net		$ 32,800