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DISPOSITIONS - DISPOSITIONS - (Details) $ in Thousands	3 Months Ended			9 Months Ended
DISPOSITIONS - DISPOSITIONS - (Details) $ in Thousands	Sep. 30, 2020 USD ($) property	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Oct. 30, 2020	Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	1,200			1,200
Proceeds from real estate disposals				$ 682,604	$ 77,555
Gain on real estate dispositions	$ 12,622		$ 36	240,101	$ 24,633
Construction in progress	567,052			567,052			$ 461,815
Impairment of real estate	$ 129,500			$ 22,600
COVID-19 Impact
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of real estate		$ 108,800
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	377			377
Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on real estate dispositions				$ 15,500
Proceeds from sale of real estate				$ 67,700
Dispositions \| 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	10			10
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			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			3
Dispositions \| Other Property [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	1			1
The Fund
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from real estate disposals				$ 620,000
Ownership percentage	21.00%			21.00%
Gain on real estate dispositions				$ 224,600
The Fund \| Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	6			6
GIC JV Project \| Research and Innovation Center \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage						50.00%
GIC JV Project \| Research and Innovation Center \| Subsequent Event \| GIC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage by other owners						45.00%
Same Campus \| The Fund \| Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	2			2