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Fair Value Of Financial Instruments (Schedule Of Impact On Carrying Value Of Cell C Investment) (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
[1]
1.5% 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 1% change $ 3,151
1.5% 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 1% change $ 4,709
[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 1.5% increase and a 1.5% decrease is presented.