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Equity-Accounted Investments And Other Long-Term Assets (Summary Of Other Long-Term Asset) (Details) - USD ($)
Jun. 30, 2020
Jun. 30, 2019
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Total equity investments $ 26,993,000 $ 26,993,000
Total held to maturity investments 0 0
Long-term portion of amount due from DNI related to sale of remaining interest in DNI 2,857,000  
Policy holder assets under investment contracts (Note 9) 490,000 619,000
Reinsurance assets under insurance contracts (Note 9) 1,006,000 1,163,000
Total other long-term assets 31,346,000 28,775,000 [1]
Cell C [Member]    
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Total equity investments $ 0 $ 0
Equity-accounted investments, ownership percentage 15.00% 15.00%
MobiKwik [Member]    
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Total equity investments $ 26,993,000 $ 26,993,000
Equity-accounted investments, ownership percentage 12.00% 12.00%
CPS [Member]    
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Total equity investments $ 0 $ 0
Equity-accounted investments, ownership percentage 87.50% 87.50%
Cedar Cellular [Member]    
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Equity-accounted investments, ownership percentage 7.625% 7.625%
Cedar Cellular [Member] | 8.625% Notes [Member]    
Schedule Of Equity And Held To Maturity Investments [Line Items]    
Interest rate 8.625% 8.625%
[1]
Refer to Note 1