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Fair Value Of Financial Instruments (Impact of EBITDA Multiple) (Details) - Cell C [Member] - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
EBITDA Multiple   6.32%
EBITDA Multiple Of 5.82 Times [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
EBITDA Multiple 5.82%  
Sensitivity for fair value of investment $ 130,729  
EBITDA Multiple Of 6.32 Times [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
EBITDA Multiple 6.32%  
Sensitivity for fair value of investment $ 149,058  
EBITDA Multiple Of 6.82 Times [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
EBITDA Multiple 6.82%  
Sensitivity for fair value of investment $ 167,386