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Fair Value Of Financial Instruments (Schedule Of Impact On Carrying Value Of Cell C Investment) (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
1.0% Increase [Member] | Weighted Average Cost of Capital (WACC) Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of Cell C investment $ 0
1.0% Increase [Member] | EBITDA Multiple [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of Cell C investment 1,954
1.0% Decrease [Member] | Weighted Average Cost of Capital (WACC) Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of Cell C investment 621
1.0% Decrease [Member] | EBITDA Multiple [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of Cell C investment $ 0