IMPAIRMENT OF REAL ESTATE AND DISPOSITIONS (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 01, 2019 USD ($) facility	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) facility	Sep. 30, 2018 USD ($) facility	Sep. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate impairment		$ 13,966	$ 0	$ 119,102	$ 1,413
Senior Care Centers Facilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties impaired | facility				3
Skilled Nursing Transitional Care Facilities And Senior Housing Facilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate impairment				$ 23,900
Skilled Nursing Transitional Care Facilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties impaired | facility				5
Senior Housing Facilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties impaired | facility				4
Senior Housing Facilities | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate impairment					$ 500
Number of facilities sold with related impairment | facility					1
Senior Care Centers Sale Facilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate impairment				$ 95,200
Senior Care Centers Sale Facilities | Senior Care Centers
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of facilities sold | facility	28
Aggregate sale price of facility	$ 282,500
2019 Dispositions | Skilled Nursing Transitional Care Facilities And Senior Housing Facilities [Member] | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate sale price of facility		315,000		315,000
Carrying value of assets and liabilities of facility		$ 313,800		313,800
Net loss on sale				1,200
Net income from facilities				$ 2,800	$ 22,300
2019 Dispositions | Skilled Nursing Transitional Care Facilities | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of facilities sold | facility				31
2019 Dispositions | Senior Housing Facilities | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of facilities sold | facility				7
2018 Dispositions | Skilled Nursing Transitional Care Facilities And Senior Housing Facilities [Member] | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate sale price of facility			290,900		290,900
Carrying value of assets and liabilities of facility			$ 148,500		148,500
Net loss on sale					142,400
Net income from facilities					$ 12,500	$ 24,900
2018 Dispositions | Skilled Nursing Transitional Care Facilities | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of facilities sold | facility					36
2018 Dispositions | Senior Housing Facilities | Dispositions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of facilities sold | facility					4