DISPOSITIONS - Real Estate Assets Held For Sale (Details) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($) property	Dec. 31, 2019 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	1,200
Assets held for sale	$ 15,748	$ 85,527
Liabilities related to assets held for sale	1,987	5,224
Depreciation Expense on Reclassified Assets	100
Triple-Net Leased Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	0	62,098
Liabilities related to assets held for sale	0	1,623
Office Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	7,441	5,177
Liabilities related to assets held for sale	785	499
Senior Living Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	8,307	18,252
Liabilities related to assets held for sale	$ 1,202	$ 3,102
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	4	14
Disposal Group, Held-for-sale, Not Discontinued Operations \| Triple-Net Leased Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	0	8
Disposal Group, Held-for-sale, Not Discontinued Operations \| Office Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	2	1
Disposal Group, Held-for-sale, Not Discontinued Operations \| Senior Living Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	2	5
Dispositions \| Medical Office Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	1
Dispositions \| Senior Housing Communities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	3

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

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