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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Jul. 01, 2017
Jul. 01, 2016
Related Party Transaction [Line Items]              
Total rental income $ 78,079 $ 78,135 $ 231,172 $ 221,100      
Investment in WBW CHP LLC (in percent)     47.70%        
WBW CHP LLC              
Related Party Transaction [Line Items]              
Amount recovered for reimbursements of operating expense for related party     $ 800 $ 800      
ICW Inc | Board of Directors Chairman              
Related Party Transaction [Line Items]              
Prepaid Insurance           $ 200 $ 200
EDisability, LLC | Board of Directors Chairman              
Related Party Transaction [Line Items]              
Lease term 5 years   5 years        
Scenario, Forecast | EDisability, LLC | Board of Directors Chairman              
Related Party Transaction [Line Items]              
Total rental income         $ 200