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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
lease
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]      
Equity investment portfolio (less than $1.0 million)   $ 1,000  
Long term capital lease obligation   $ 4,620 $ 4,722
Number of leased facilities | lease   13  
Forecast | Use Rights      
Property, Plant and Equipment [Line Items]      
Property, plant, and equipment, gross $ 5,000    
Long term capital lease obligation $ 5,000