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Segment Disclosures - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019 facility	Dec. 31, 2019 USD ($) facility	Dec. 31, 2018 USD ($) facility	Dec. 31, 2017 USD ($) facility
Segment Reporting Information [Line Items]
Impairment related to goodwill		$ 0	$ 0	$ 0
Goodwill		$ 47,000,000	$ 47,000,000
Senior housing triple-net
Segment Reporting Information [Line Items]
Number of SH NNN facilities transitioned to RIDEA structure (in facilities) | facility		41	22	25
Medical office
Segment Reporting Information [Line Items]
Number of SH NNN facilities transitioned to RIDEA structure (in facilities) | facility	2	2
Operating segment | Senior housing triple-net
Segment Reporting Information [Line Items]
Goodwill		$ 14,000,000	$ 21,000,000
Goodwill transfers		(7,000,000)
Operating segment | SHOP
Segment Reporting Information [Line Items]
Goodwill		16,000,000	9,000,000
Goodwill transfers		7,000,000
Operating segment | Medical office
Segment Reporting Information [Line Items]
Goodwill		13,000,000	11,000,000
Goodwill transfers		2,000,000
Operating segment | Other non-reportable segments
Segment Reporting Information [Line Items]
Goodwill		4,000,000	$ 6,000,000
Goodwill transfers		$ (2,000,000)

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