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Investments in and Advances to Unconsolidated Joint Ventures - Narrative (Details) $ in Thousands, £ in Millions		1 Months Ended		12 Months Ended
	Jan. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2020 USD ($) property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2020 property	Oct. 31, 2019 property
Schedule of Equity Method Investments [Line Items]
Difference between carrying amount and underlying equity		$ (63,000)		$ 33,000	$ (63,000)
Impairment charge					6,000
Property count | property	15
Losses on sales of investment real estate				$ (90,350)	40	$ (831,368)
CCRC JV Investment
Schedule of Equity Method Investments [Line Items]
Impairment charge					$ 12,000
Investment ownership percentage	49.00%	49.00%		49.00%	49.00%
U.K. JV
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage		49.00%			49.00%
Proceeds from sale of equity method investments		$ 91,000	£ 70
Loss on sale of properties		7,000
Losses on sales of investment real estate		$ 1,000
Brookedale MTCA
Schedule of Equity Method Investments [Line Items]
Losses on sales of investment real estate	$ (164,000)
Brookedale MTCA | CCRC JV Investment
Schedule of Equity Method Investments [Line Items]
Interest acquired	51.00%
CCRC JV Investment | Brookedale MTCA
Schedule of Equity Method Investments [Line Items]
Property count | property	15
Assets leased to others | Other Non-Reporting Segment
Schedule of Equity Method Investments [Line Items]
Property count | property							1
Assets leased to others | Other Non-Reporting Segment | Brookedale MTCA
Schedule of Equity Method Investments [Line Items]
Property count | property	13
Assets leased to others | Other Non-Reporting Segment | CCRC JV Investment
Schedule of Equity Method Investments [Line Items]
Property count | property							15	15
Assets leased to others | Other Non-Reporting Segment | CCRC JV Investment | Brookedale MTCA
Schedule of Equity Method Investments [Line Items]
Property count | property	13			13			13

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