FAIR VALUE DISCLOSURES - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($) Property acquisition	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Payment of contingent consideration		$ 0
Facilities transitioned to managed property structure with earn out terminated | Property		8
Change in fair value of contingent consideration		$ 552	$ (50)
Recurring [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liability	$ 266	$ 266		$ 818
Acquisitions With Contingent Consideration Arrangements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of real estate acquisitions | acquisition		3
Other Operating Income (Expense) [Member] | Acquisitions With Contingent Consideration Arrangements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Change in fair value of contingent consideration	$ 300	$ (600)