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REVENUE AND ACCOUNTS RECEIVABLE - NARRATIVE (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disaggregation of Revenue [Line Items]          
Funds received from the PRF $ 9,858        
Contract Liabilities (CARES Act advance payments) $ 27,997   $ 27,997   $ 0
Senior Living Services          
Disaggregation of Revenue [Line Items]          
Payment terms     Residency agreements are generally for a term of 30 days, with resident fees billed monthly in advance. For residents under reimbursement arrangements with Medicaid, revenue is recorded based on contractually agreed-upon amounts or rates on a per resident, daily basis or as services are rendered.    
Customer concentration risk | Revenue          
Disaggregation of Revenue [Line Items]          
Revenue % 100.00% 100.00% 100.00% 100.00%  
Customer concentration risk | Revenue | Medicare and medicaid          
Disaggregation of Revenue [Line Items]          
Revenue % 59.40% 54.90% 58.70% 54.10%