REAL ESTATE - Operating Leases, Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Operating Leased Assets [Line Items]
Deferred rent recognized	$ 1,628	$ 1,874
Deferred rent receivables	82,100		$ 80,000
Incentive to lessee	21,400		21,000
Lease Revenue
Operating Leased Assets [Line Items]
Bed debt expense (reversal)	2,200	700
Operating, Maintenance and Management Expense
Operating Leased Assets [Line Items]
Bed debt expense (reversal)	0	$ (300)
Other liabilities, at fair value
Operating Leased Assets [Line Items]
Security deposit liability	$ 8,800		$ 8,800
Maximum
Operating Leased Assets [Line Items]
Operating leases, term of contract	17 years 3 months 18 days
Weighted Average
Operating Leased Assets [Line Items]
Operating leases, term of contract	4 years 9 months 18 days