FAIR VALUE MEASUREMENT FAIR VALUE MEASUREMENT - Purchase Option Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Purchase Option Roll Forward [Roll Forward]
Asset Impairment Charges	$ (782)	$ 0
Real Estate Loan 1
Purchase Option Roll Forward [Roll Forward]
Purchase Option Value	2,382
Asset Impairment Charges	(782)
Purchase Option Value	1,600
Real Estate Loan 2
Purchase Option Roll Forward [Roll Forward]
Purchase Option Value	2,761
Asset Impairment Charges	0
Purchase Option Value	2,761
Real Estate Loan 3
Purchase Option Roll Forward [Roll Forward]
Purchase Option Value	977
Asset Impairment Charges	0
Purchase Option Value	977
Real Estate Loan 4
Purchase Option Roll Forward [Roll Forward]
Purchase Option Value	2,800
Asset Impairment Charges	0
Purchase Option Value	$ 2,800