IMPAIRMENT OF REAL ESTATE AND DISPOSITIONS (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 01, 2019 USD ($) facility	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) facility	Jun. 30, 2018 USD ($) facility	Jun. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate impairment		$ 2,002	$ 881	$ 105,136	$ 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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate impairment				$ 12,900
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				$ 92,200
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				$ 3,100	$ 18,000
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			278,300		278,300
Carrying value of assets and liabilities of facility			$ 135,800		135,800
Net loss on sale					142,500
Net income from facilities					11,600	$ 15,400
Selling expenses					$ 100
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					33
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