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Fair Value Of Financial Instruments (Schedule Of Impact On Carrying Value Of Cell C Investment) (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Percentage increase not impacting investment value 1.00%
Percentage decrease not impacting investment value 1.00%
Percentage increase impacting investment value 3.00%
3.0% 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
3.0% Increase [Member] | EBITDA Multiple [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of Cell C investment $ 4,873
2.0% Decrease [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Percentage decrease impacting investment value 2.00%
2.0% 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 $ 3,055
2.0% Decrease [Member] | EBITDA Multiple [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of Cell C investment $ 0