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FAIR VALUE MEASUREMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Transfers into Level3   $ 0   $ 0
Transfers out of Level3   0   0
Impairment of Goodwill $ 0 4,396   $ 17,894
Impairment of property and equipment   942 $ 2,282  
Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of Goodwill   4,396    
Impairment of property and equipment   942    
Nonrecurring | Carrying value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill   4,396    
Property and equipment   5,712    
Level 3 | Nonrecurring | Fair value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Property and equipment   $ 4,770