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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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DISPOSITIONS - DISPOSITIONS - (Details) $ in Thousands	3 Months Ended		6 Months Ended
DISPOSITIONS - DISPOSITIONS - (Details) $ in Thousands	Jun. 30, 2021 USD ($) property	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) property	Jun. 30, 2020 USD ($)	Dec. 31, 2020 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			$ 115,850	$ 627,804
Gain on real estate dispositions	$ 41,258	$ 1,254	43,791	227,479
Construction in progress	$ 288,910		288,910		$ 265,748
Impairment of real estate			$ 97,100	$ 121,500
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	358		358
Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on real estate dispositions			$ 43,800
Proceeds from sale of real estate			$ 115,900
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	1		1
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	5		5