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SUBSEQUENT EVENTS - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Subsequent Event [Line Items]      
Associated costs paid   $ 27 $ 72
Senior Notes | Senior Secured Second Lien Notes Due 2021      
Subsequent Event [Line Items]      
Extinguishment of debt   10,868  
Senior notes   652,078  
Associated costs paid   27  
Unamortized discount   312  
Repayments of senior debt   $ 10,556  
Senior Notes | Senior Secured Second Lien Notes Due 2021 | Subsequent Event      
Subsequent Event [Line Items]      
Extinguishment of debt $ 7,000    
Senior notes 645,078    
Associated costs paid 18    
Unamortized discount 526    
Repayments of senior debt $ 6,474