COMMITMENTS AND CONTINGENCIES (Details)					1 Months Ended	9 Months Ended
	Oct. 29, 2020 USD ($)	Oct. 28, 2020 USD ($)	Sep. 30, 2020 USD ($) property	Aug. 30, 2020 USD ($)	Nov. 13, 2020 USD ($)	Sep. 30, 2020 USD ($) property	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Cash and cash equivalents			$ 181,149,000			$ 181,149,000	$ 473,355,000	$ 17,976,000	$ 19,674,000
Property Acquisition
Loss Contingencies [Line Items]
Percent of asset acquired			100.00%			100.00%
Number of properties acquired | property			1			1
Payment to acquire assets			$ 20,800,000
Escrow deposit			300,000			$ 300,000
CCIT III
Loss Contingencies [Line Items]
Termination fees				$ 710,000
Reimbursement expenses (up to)				130,000
CCPT V
Loss Contingencies [Line Items]
Termination fees				9,850,000
Reimbursement expenses (up to)				$ 1,790,000
Merger Agreement
Loss Contingencies [Line Items]
Termination period				12 months
Percent of equity or assets acquired				50.00%
Percent of company equity				50.00%
Subsequent event | CCPT V
Loss Contingencies [Line Items]
Termination fees	$ 9,850,000	$ 9,170,000
Reimbursement expenses (up to)	1,790,000	1,670,000
Subsequent event | CCIT II
Loss Contingencies [Line Items]
Termination fees	7,380,000	7,380,000
Reimbursement expenses (up to)	$ 3,690,000	$ 3,690,000
Broadly Syndicated Loans
Loss Contingencies [Line Items]
Loans settled						28,600,000
Broadly Syndicated Loans | Subsequent event
Loss Contingencies [Line Items]
Loans settled					$ 28,600,000
Reserves For Settlement Of Loan Acquisitions
Loss Contingencies [Line Items]
Cash and cash equivalents			42,100,000			42,100,000
Reserves For Settlement Of Loan Sales
Loss Contingencies [Line Items]
Cash and cash equivalents			3,500,000			3,500,000
Unfunded Loan Commitment
Loss Contingencies [Line Items]
Other commitment			$ 61,800,000			$ 61,800,000