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INCOME TAXES (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
facility
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
facility
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 22, 2019
center
Income Tax Disclosure [Abstract]            
Income tax expense (benefit) $ 17,351 $ (425) $ 16,396 $ (463)    
Contingent liability expense     $ 9,500      
Tax Cuts and Jobs Act, additional income tax expense         $ 5,500  
Number of nursing center facilities terminated 10   10     10
Deferred tax asset, valuation allowance $ 20,000   $ 20,000