BUSINESS DEVELOPMENTS AND OTHER SIGNIFICANT TRANSACTIONS - Narrative (Details) $ in Thousands			12 Months Ended
	Dec. 01, 2018 USD ($)	Oct. 01, 2018 extension center	Dec. 31, 2018 USD ($)	Mar. 31, 2019 center
Business Acquisition [Line Items]
Number of nursing center facilities leased | center		34		57
Number of skilled nursing centers under lease | center		23
Operating lease, initial term		12 years
Number of lease extensions allowed | extension		2
Lease extension period		10 years
Annual lease fixed escalators, percent		2.15%
Kentucky Properties
Business Acquisition [Line Items]
Proceeds from sale of assets | $	$ 18,700
Carrying value of centers | $			$ 13,331
Gain on disposition of assets | $			$ 4,825
Omega Healthcare Investors Inc
Business Acquisition [Line Items]
Number of nursing center facilities leased | center		11