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Leases - Direct Financing Lease Sale and Conversion (Details)	3 Months Ended				9 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) facility	Mar. 31, 2019 USD ($) property	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) property
Lessor, Lease, Description [Line Items]
Proceeds from sale of lease receivable	$ 82,000,000
Gain on sale of direct financing lease	$ 42,000,000
Conversion of DFLs to real estate					$ 0	$ 350,540,000
Intangible assets, net					$ 501,583,000		$ 331,693,000
Properties subject to direct financing leases | property					1		2
Impairments and loan loss reserves (recoveries), net					$ 97,723,000	115,653,000
Income from DFLs		$ 5,000,000				17,000,000
Cash payments received		$ 5,000,000				$ 16,000,000
SHOP
Lessor, Lease, Description [Line Items]
Proceeds from sale of lease receivable			$ 274,000,000
Number of leases disposed of (in facilities) | facility			13
Impairments and loan loss reserves (recoveries), net			$ 10,000,000
DFL Portfolio | Watch List DFLs | Senior Housing Triple-Net
Lessor, Lease, Description [Line Items]
Properties with derecognized carrying value during the period (in properties) | property				14
Conversion of DFLs to real estate				$ 351,000,000
DFL Portfolio | Watch List DFLs | Senior Housing Triple-Net | Real Estate Investment
Lessor, Lease, Description [Line Items]
Real estate investment property				331,000,000
DFL Portfolio | Watch List DFLs | Senior Housing Triple-Net | Intangible Assets
Lessor, Lease, Description [Line Items]
Intangible assets, net				20,000,000
DFL Portfolio | Watch List DFLs | SHOP
Lessor, Lease, Description [Line Items]
Gain (loss) on recognition of lease				$ 0
Properties subject to direct financing leases | property				14

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