DISPOSITIONS - Real Estate Assets Classified As Held For Sale (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of properties held for sale \| property	3	3
Assets held for sale	$ 62,534	$ 65,413
Liabilities related to assets held for sale	$ 60,023	$ 60,265
Medical Office Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Properties no longer classified as held for sale \| property	5
Depreciation adjustment to properties no longer held for sale	$ 5,700
Office Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of properties held for sale \| property	3	3
Assets held for sale	$ 62,806	$ 65,413
Liabilities related to assets held for sale	$ 60,140	$ 60,265
Senior Living Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Number of properties held for sale \| property	0	0
Assets held for sale	$ (272)	$ 0
Liabilities related to assets held for sale	$ (117)	$ 0

Amount classified as assets attributable to disposal group held for sale or disposed of.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount classified as liabilities attributable to disposal group held for sale or disposed of.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Properties no longer classified as held for sale

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