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BUSINESS DEVELOPMENTS AND OTHER SIGNIFICANT TRANSACTIONS - Narrative (Details) $ in Thousands		3 Months Ended				9 Months Ended		12 Months Ended
	Jul. 01, 2017 USD ($) bed	Sep. 30, 2018 USD ($) bed	Mar. 31, 2018 facility	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2018 USD ($) bed	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Number of licensed nursing beds \| bed		8,456				8,456
Number of skilled nursing facilities classified as held for sale \| facility			3
Assets held for sale		$ 13,299				$ 13,299		$ 0
Cash termination payment		$ 13,764		$ 13,791		41,202	$ 41,297
Gain on sale of investment in unconsolidated affiliate						308	733
Selma Nursing Centers
Business Acquisition [Line Items]
Number of licensed nursing beds \| bed	103
Purchase Price	$ 8,750
Business acquisition, acquisition expenses								140
Gain on bargain purchase	$ 925							925
Unnamed pharmacy joint venture
Business Acquisition [Line Items]
Gain on sale of investment in unconsolidated affiliate					$ 1,366	$ 308	$ 733
Trend Health and Rehab of Carthage, LLC (Trend Health)
Business Acquisition [Line Items]
Cash termination payment								$ 250