REAL ESTATE PROPERTIES HELD FOR INVESTMENT - Narrative (Details) $ in Thousands			3 Months Ended	6 Months Ended
	Jul. 01, 2017 Property	Jun. 30, 2017 USD ($) Property acquisition Facilitiy	Jun. 30, 2017 USD ($) Property acquisition Facilitiy	Jun. 30, 2017 USD ($) Property acquisition Facilitiy	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Real Estate Properties [Line Items]
Payment of contingent consideration				$ 0
Facilities transitioned to managed property structure with earn out terminated | Property				8
Facilities transitioned to managed property structure | Property				9
Change in fair value of contingent consideration				$ 822	$ 50
Weighted average lease expiration period				9 years
Security deposit liability		$ 2,000	$ 2,000	$ 2,000		$ 2,700
Reserve for unpaid cash rents		3,300	3,300	3,300		3,200
Allowance for straight-line rental income		$ 2,200	$ 2,200	$ 2,200		$ 3,700
Genesis [Member]
Real Estate Properties [Line Items]
Memoranda of understanding facilities | Facilitiy		33		35
Number of leased facilities | Facilitiy		43	43	43
Number of facilities sold | Property		1
Minimum [Member]
Real Estate Properties [Line Items]
Lease expiration period				3 years
Maximum [Member]
Real Estate Properties [Line Items]
Lease expiration period				15 years
Acquisitions With Contingent Consideration Arrangements [Member]
Real Estate Properties [Line Items]
Number of Properties | acquisition		3	3	3
Estimated earn-out value		$ 3,200	$ 3,200	$ 3,200
Acquisitions With Contingent Consideration Arrangements [Member] | Accounts Payable and Accrued Liabilities [Member]
Real Estate Properties [Line Items]
Contingent consideration liability		$ 0	0	0
Acquisitions With Contingent Consideration Arrangements [Member] | Other Operating Income (Expense) [Member]
Real Estate Properties [Line Items]
Change in fair value of contingent consideration			$ 0	$ 800
Non Triple-net Operating Leases [Member]
Real Estate Properties [Line Items]
Number of Properties | Property		11	11	11
Subsequent Event [Member] | Genesis [Member]
Real Estate Properties [Line Items]
Number of facilities sold | Property	1