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Acquisitions, Dispositions and Other Significant Transactions - Blackstone Venture (Details) $ in Thousands		1 Months Ended	3 Months Ended								12 Months Ended
	Mar. 29, 2017 USD ($) community	Apr. 30, 2018 community	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) community	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Payments to acquire joint venture											$ 9,124	$ 199,017	$ 13,377
Goodwill and asset impairment			$ 37,927	$ 5,500	$ 16,103	$ 430,363	$ 18,966	$ 368,551	$ 1,559	$ 20,706	489,893	409,782	248,515
Change in valuation allowance											329	71,782
Gain on sale of assets, net			$ 216,660	$ 9,833	$ 23,322	43,431					$ 293,246	$ 19,273	$ 7,218
HCP, Inc.
Business Acquisition [Line Items]
Number of communities acquired | community		5
Term of lease	12 years
Formation of the Blackstone Venture
Business Acquisition [Line Items]
Change in valuation allowance										85,000
Joint Venture | Blackstone Venture
Business Acquisition [Line Items]
Number of community leasehold interests contributed | community	62
Payments to acquire joint venture	$ 179,200
Ownership Percentage	15.00%
Carrying value of investment	$ 66,800
Fair value of investment	$ 47,100
Goodwill and asset impairment						$ 33,400				$ 19,700
Equity interest sold				15.00%
Payment to complete sale of joint venture interest				$ 2,000
Gain on sale of assets, net				$ 3,800
Joint Venture | Blackstone Venture | Senior Housing Communities
Business Acquisition [Line Items]
Number of communities acquired | community	64
Purchase price	$ 1,100,000
Number of communities managed by third party | community	2
Blackstone Venture
Business Acquisition [Line Items]
Number of communities leased | community	2
Number of communities managed | community	60
2 Leased Communities Owned By Joint Venture Terminated | Blackstone Venture
Business Acquisition [Line Items]
Number of communities disposed of | community				2

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