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Fair Value Of Financial Instruments (Schedule Of Impact On Carrying Value Of Cell C Investment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jun. 30, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Sensitivity for fair value of investment, increase (decrease) in valuation $ 76,297 $ 76,297
4.2% Increase [Member] | Weighted Average Cost of Capital (WACC) Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Sensitivity for fair value of investment, increase (decrease) in valuation 0  
4.2% Increase [Member] | EBITDA Multiple [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Sensitivity for fair value of investment, increase (decrease) in valuation 400  
3.2% Decrease [Member] | Weighted Average Cost of Capital (WACC) Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Sensitivity for fair value of investment, increase (decrease) in valuation 294  
3.2% Decrease [Member] | EBITDA Multiple [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Sensitivity for fair value of investment, increase (decrease) in valuation $ 0