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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Mar. 31, 2017
Cash and Cash Equivalents [Line Items]        
Proceeds from Collection of Retained Interest in Securitized Receivables $ 76,241 $ 75,543    
Value added tax expense 3,876 3,854    
Cash and cash equivalents 202,107 264,406 $ 264,660 $ 473,110
Purchases of property, plant and equipment 1,854 583    
Interest expense 32,912 34,442    
Accounting Standards Update 2016-15        
Cash and Cash Equivalents [Line Items]        
Cash collections from beneficial interests 75,543      
Proceeds from Collection of Retained Interest in Securitized Receivables 58,557      
Accounting Standards Update 2016-18        
Cash and Cash Equivalents [Line Items]        
Change in restricted cash   17    
Restricted cash   $ 2,326 $ 3,373  
Interest expense 341      
Zimbabwe | Cash Held in Real Time Gross Settlement System        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 2,638