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Fair Value Of Financial Instruments (Impact of EBITDA Multiple) (Details) - Cell C [Member]
$ in Thousands
Jun. 30, 2019
USD ($)
1% 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 $ 9,875
1% 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 $ 9,632