RELATED-PARTY TRANSACTIONS AND ARRANGEMENTS (Subordinated Performance Fees) (Details) - Advisors - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Related Party Transaction [Line Items]
Cumulative noncompounded annual return	6.00%		6.00%
Subordinate performance fee on event of sale of company
Related Party Transaction [Line Items]
Commissions performance and other fees percent	15.00%		15.00%
Subordinate performance fees for listing
Related Party Transaction [Line Items]
Commissions performance and other fees percent	15.00%		15.00%
Performance fee
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 0	$ 0	$ 0	$ 0