ASSETS HELD FOR SALE ASSETS HELD FOR SALE - Schedule for assets held for sale (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2018 building segment	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Long Lived Assets Held-for-sale [Line Items]
Number Of Buildings Held For Sale | building	2
Assets held for sale			$ 0	$ 0	$ 21,328
Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Gross					22,063
Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Accumulated Depreciation, Depletion And Amortization					(1,278)
Assets Held-For-Sale, Not Part Of Disposal Group, Property, Plant, And Equipment, Net					20,785
Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Gross					961
Accumulated Amortization			$ (90,267)	$ (90,267)	(38,941)
Assets Held-For-Sale, Not Part Of Disposal Group, Finite-Lived Intangible Assets, Net					493
Disposal Group, Including Discontinued Operation, Consideration		$ 24,400
Number of reportable segments	1		3	3
Land
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale					5,818
Building
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale					14,984
Site improvements
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale					950
Computer equipment and capitalized software
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale					166
Furniture and other equipment
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale					145
Tenant leases
Long Lived Assets Held-for-sale [Line Items]
Assets held for sale					961
Accumulated Amortization					$ (468)
Two Office Buildings In Charlotte, NC | Discontinued Operations, Disposed of by Sale [Member]
Long Lived Assets Held-for-sale [Line Items]
Disposal Group, Including Discontinued Operation, Closing Fee		300
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		$ 2,700