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Leases and Management Agreements with Five Star (Details) - Five Star $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) living_unit community	Jun. 30, 2017 USD ($) community	Jun. 30, 2018 USD ($) living_unit community lease_agreement	Jun. 30, 2017 USD ($) community	Dec. 31, 2017 USD ($)
Number of communities leased by the Company | community	184	185	184	185
Number of leases with related party | lease_agreement			5
Total rental income recognized	$ 51,692	$ 51,123	$ 103,450	$ 102,108
Related party transaction, annual rents due	1,289	1,392	2,664	2,837
Rents receivable	$ 17,198		17,198		$ 18,539
Real estate improvements purchased			8,529	19,308
Increase or decrease in annual lease rent payable			$ 680	1,547
Number of communities owned and managed by related party | living_unit	98		98
Management fees as a percentage of gross revenues (equal to)	5.00%		5.00%
Incentive fee as percentage of annual net operating income	20.00%		20.00%
Annual minimum return	$ 1,000		$ 1,000
Annual Return as percentage of invested capital	7.00%		7.00%
Invested capital (in excess of)	$ 500		$ 500
Property management agreement expense	$ 3,533	3,554	$ 7,027	$ 7,117
Rents from significant lessee | Revenues
Percentage of rental income	18.60%		18.70%
Rents from significant lessee | Investment
Percentage of rental income			26.90%
Senior Living Communities
Number of communities managed by related party | community			75	68
Rehabilitation Services
Expenses from transactions with related party	$ 1,660	$ 1,886	$ 3,359	$ 3,868

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- Definition

Represents the increase or decrease on the annual rent the lessee is obligated to pay on an operating lease.

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Represents the number of communities managed by a related party.

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Represents the amount of improvements to real estate properties made by lessees and purchased by the entity.

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Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

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Represents the annual return as a percentage of the entity's invested surplus used to determine the incentive fee payable to related parties.

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Represents the incentive fee payable to related parties under property management agreement expressed as a percentage of the annual net operating income after the entity realizes an annual return equal to specified percentage of its invested capital.

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Represents the management fees payable to related parties under property management agreement expressed as a percentage of gross revenues.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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-Name Accounting Standards Codification
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