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Fair Value Of Financial Instruments (Schedule Of Impact On Carrying Value Of Cell C Investment) (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
[1]
6.0% Increase [Member] | Weighted Average Cost of Capital (WACC) Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of investment, increase (decrease) in valuation based on 2% change $ 0
6.0% Increase [Member] | EBITDA Multiple [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of investment, increase (decrease) in valuation based on 2% change 1,218
4.0% Decrease [Member] | Weighted Average Cost of Capital (WACC) Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of investment, increase (decrease) in valuation based on 2% change 2,468
4.0% Decrease [Member] | EBITDA Multiple [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Sensitivity for fair value of investment, increase (decrease) in valuation based on 2% change $ 0
[1]
the carrying value of the Cell C investment is not impacted by a 1.0% increase or a 1.0% decrease and therefore the impact of a 6.0% increase and a 4.0% decrease is presented.