BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Distributions for Federal Income Tax Purposes (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Capital gain	38.53%	100.00%	48.87%
Ordinary income	23.43%	0.00%	14.59%
Return of capital	38.04%	0.00%	36.54%