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Accounts Receivable, Net And Other Receivables And Finance Loans Receivable, Net (Schedule Of Accounts Receivable, Net And Other Receivables) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Less: Payments to agents in South Korea amortized over the contract period included in other long-term assets (Note 6) $ 7,700 $ 9,564
Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, trade, net 27,106 25,136
Accounts receivable, trade, gross 28,163 26,377
Allowance for doubtful accounts receivable, end of year 1,057 1,241
Beginning of year 1,241 1,101
Reversed to statement of operations (21) (24)
Charged to statement of operations (70) 3,296
Utilized (35) (3,059)
Deconsolidation (38)
Foreign currency adjustment (58) (35)
Current portion of payments to agents in South Korea amortized over the contract period 13,546 15,543
Payments to agents in South Korea amortized over the contract period 21,246 25,107
Less: Payments to agents in South Korea amortized over the contract period included in other long-term assets (Note 6) 7,700 9,564
Other receivables 27,628 24,555
Total accounts receivable, net 71,280 72,494
Carbon [Member] | Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan provided 3,000 3,000
DNI [Member] | Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loan provided $ 4,260