The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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Impairment losses measured as the amount by which the carrying amount of the business or real estate partnerships exceeds the fair value of the business or partnership.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Decrease in debt related to investment in unconsolidated entities

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Represents the gain or loss on remeasurement of equity method investment during the period as a result of acquiring the majority ownership interest of our investment previously accounted for as an equity method investment.

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Revenue received from third parties for management fees and construction revenue.

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The number of properties that are accounted for under the equity method of accounting.

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Potential management fee revenue lost due to sale of interest in joint venture

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Properties Acquired Previously Owned by Equity Method Investee

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Investments in Unconsolidated Entities (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Jul. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Feb. 28, 2017 USD ($) property	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Equity method investments
Ownership interests in properties accounted for under the equity method				25.00%
Number of properties accounted for under equity method \| property				5
Impairment losses related to real estate partnerships		$ 35,700
Payments to acquire businesses						$ 1,428,944
Gain (Loss) on re-measurement of equity interests upon acquisition, net				$ 0	$ 3,027	0
Seniors Housing Communities
Equity method investments
Properties acquired previously owned by equity method investee \| property			6
Payments to acquire businesses			$ 100,000
Gain (Loss) on re-measurement of equity interests upon acquisition, net			$ 3,000
Real Estate Joint Ventures
Equity method investments
Proceeds from sale of equity method investments	$ 57,500
Equity method investment, realized gain (loss) on disposal	900
Decrease in debt related to investment in unconsolidated entities	23,300
Potential management fee revenue lost due to sale of interest in joint venture	$ 4,600
Management Service
Equity method investments
Management fees earned				$ 5,800	$ 6,300	$ 6,700
Atria
Equity method investments
Ownership interests in properties accounted for under the equity method				34.00%
Eclipse Senior Living
Equity method investments
Ownership interests in properties accounted for under the equity method				34.00%
Ardent
Equity method investments
Ownership interests in properties accounted for under the equity method				9.80%
2018 Dispositions \| Real Estate Joint Ventures
Equity method investments
Ownership interests in properties accounted for under the equity method	25.00%