INCOME TAXES - Taxable Distributions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Taxable Distributions Paid Per Common Share [Abstract]
Ordinary income	$ 0.981	$ 0.774	$ 1.018
Qualified ordinary income	0.004	0.006	0.011
Long-term capital gain	0.021	0.058	0.133
Unrecapture section 1250 gain	0.063	0.233	0.063
Nondividend distributions	0.281	0.207
Taxable distributions per common share	$ 1.350	$ 1.278	$ 1.225