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Real Estate Properties (Details) $ in Thousands	1 Months Ended					2 Months Ended	3 Months Ended
	Mar. 31, 2018 USD ($) ft² building community property	Feb. 28, 2018 USD ($) living_unit community property	Jan. 31, 2018 USD ($) ft² living_unit building community property	Dec. 31, 2017 USD ($) state living_unit property	Nov. 30, 2017 property	Feb. 28, 2018 USD ($) living_unit property	Jun. 30, 2018 USD ($) community	Mar. 31, 2018 USD ($) ft² building community property	Mar. 31, 2017 USD ($)
Real Estate Properties
Number of properties owned | property	444							444
Number of buildings owned | building	470							470
Number of states in which properties are located | state				42
Assumed Debt								$ 27,798	$ 0
Impairment of assets								$ 0
Discontinued Operations, Held-for-sale
Real Estate Properties
Number of real estate properties held-for-sale | community	2							2
Real estate held-for-sale	$ 18,479							$ 18,479
Five Star | Senior Living Communities
Real Estate Properties
Number of properties | property					6
Five Star | Senior Living Communities | Alabama and Indiana
Real Estate Properties
Number of properties | property				2
Purchase price excluding closing costs				$ 39,457
Acquisition and certain other transaction related costs				$ 307
Number of acquired private pay independent living units | living_unit				229
Five Star | Senior Living Communities | Tennessee
Real Estate Properties
Number of properties | community			1
Purchase price excluding closing costs			$ 19,868
Acquisition and certain other transaction related costs			$ 201
Number of acquired private pay independent living units | living_unit			88
Five Star | Senior Living Communities | Arizona
Real Estate Properties
Number of properties | community		1
Purchase price excluding closing costs		$ 22,622
Acquisition and certain other transaction related costs		$ 372
Number of acquired private pay independent living units | living_unit		127
Assumed Debt		$ 16,748
Scenario, Forecast | Five Star | Senior Living Communities
Real Estate Properties
Number of properties | community							2
Purchase price excluding closing costs							$ 23,300
Assumed Debt							$ 16,800
Acquisition | MOBs
Real Estate Properties
Number of properties | property								4
Number of buildings acquired | building								4
Area of real estate properties (in square feet) | ft²	535,000							535,000
Assumed Debt								$ 11,050
Acquisition | MOBs | Kansas, Missouri And California
Real Estate Properties
Number of properties | property			3
Acquisition and certain other transaction related costs			$ 544
Number of buildings acquired | building			3
Area of real estate properties (in square feet) | ft²			400,000
Assumed Debt			$ 0
Acquisition | MOBs | Virginia
Real Estate Properties
Number of properties | property	1
Acquisition and certain other transaction related costs	$ 525
Number of buildings acquired | building	1
Area of real estate properties (in square feet) | ft²	135,000							135,000
Assumed Debt	$ 11,050
Acquisition | Five Star | Senior Living Communities
Real Estate Properties
Number of properties | property						2
Number of acquired private pay independent living units | living_unit						215
Assumed Debt						$ 16,748
Acquisition | Five Star | Senior Living Communities | Tennessee
Real Estate Properties
Number of properties | property			1
Assumed Debt			$ 0
Acquisition | Five Star | Senior Living Communities | Arizona
Real Estate Properties
Number of properties | property		1
Assumed Debt		$ 16,748

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Acquisition Costs Incurred

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The number of buildings owned as of the balance sheet date.

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The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date.

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Area of a real estate property.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

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