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ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]            
Shareholders' equity $ 92,241 $ 93,452 $ 98,215 $ 113,346 $ 103,205 $ 114,423
Retained earnings            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Shareholders' equity $ (312,192) $ (309,290) (303,025) $ (282,316) $ (273,938) $ (262,430)
Minimum            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Payment terms 30 days          
Maximum            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Payment terms 60 days          
Impact of adoption of ASC 326            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Shareholders' equity     348      
Impact of adoption of ASC 326 | Retained earnings            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Accounts receivable and financing receivable, allowance for credit loss, current     300      
Shareholders' equity     $ 348