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Fair Value Of Financial Instruments (Schedule Of Impact On Carrying Value Of Cell C Investment) (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
1.9% 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
1.9% Increase [Member] | EBITDA Multiple [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of Cell C investment 992
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 Cell C investment 390
3.2% Decrease [Member] | EBITDA Multiple [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of Cell C investment $ 0