FAIR VALUE MEASUREMENTS (Financial Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair value, measurements, recurring - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial assets:
CMBS	$ 16,103
Total financial assets		$ 261
Financial liabilities:
Interest rate swaps		(4,181)
Total financial liabilities	(11,200)	(4,181)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
CMBS	0
Total financial assets		0
Financial liabilities:
Interest rate swaps		0
Total financial liabilities	0	0
Significant Other Observable Inputs (Level 2)
Financial assets:
CMBS	14,367
Total financial assets		261
Financial liabilities:
Interest rate swaps		(4,181)
Total financial liabilities	(11,200)	(4,181)
Significant Unobservable Inputs (Level 3)
Financial assets:
CMBS	1,736
Total financial assets		0
Financial liabilities:
Interest rate swaps		0
Total financial liabilities	0	0
Interest rate swaps
Financial assets:
Interest rate swaps		261
Financial liabilities:
Interest rate swaps	(11,200)
Interest rate swaps | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Interest rate swaps		0
Financial liabilities:
Interest rate swaps	0
Interest rate swaps | Significant Other Observable Inputs (Level 2)
Financial assets:
Interest rate swaps		261
Financial liabilities:
Interest rate swaps	(11,200)
Interest rate swaps | Significant Unobservable Inputs (Level 3)
Financial assets:
Interest rate swaps		$ 0
Financial liabilities:
Interest rate swaps	$ 0