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Equity-Accounted Investments And Other Long-Term Assets (Narrative) (Details)
R / shares in Units, $ in Thousands, item in Billions, R in Billions
3 Months Ended 6 Months Ended
Oct. 04, 2018
USD ($)
item
Jul. 11, 2018
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
ZAR (R)
R / shares
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Market value of holding               $ 93,561 $ 88,331 [1]
Finbond [Member]                  
Share price | R / shares             R 5.35    
Market value of holding             R 1.4 $ 99,500  
Equity-accounted investments, ownership percentage             29.00% 29.00% 29.00%
Finbond [Member] | Capitalization Share Issue In Lieu Of A Dividend [Member]                  
Number of additional shares acquired | shares   6,602,551              
V2 [Member]                  
Percentage of ownership interest 50.00%                
Equity acquisition amount under purchase agreement $ 2,500                
Contribute amount 2,500                
Working capital facility $ 5,000                
Equity-accounted investments, ownership percentage             50.00% 50.00%  
V2 [Member] | Minimum [Member]                  
Number of underbanked citizens | item 1                
DNI [Member]                  
Equity-accounted investments, ownership percentage             16.00% 16.00%  
Cedar Cellular [Member]                  
Maturity date           Aug. 01, 2022      
Other-than-temporary impairment related to the credit loss     $ 2,700   $ 2,700        
Amortized cost basis before impairment         11,800        
Cedar Cellular [Member] | 8.625% Notes [Member]                  
Equity-accounted investments, ownership percentage             7.625% 7.625% 7.625%
Interest rate             8.625% 8.625% 8.625%
Cell C [Member]                  
Equity-accounted investments, ownership percentage             15.00% 15.00% 15.00%
DNI [Member]                  
Interest rate             6.30% 6.30%  
MobiKwik [Member]                  
Business acquisition, cost of acquired entity     1,100   1,100        
Equity-accounted investments, ownership percentage             12.00% 12.00%  
Cedar Cellular [Member]                  
Interest rate       24.82%   24.82%      
Interest income recognized     $ 1,200 $ 200 1,400 $ 200      
Amount expected to be recovered from debt security at maturity         22,000        
Present value of expected cash flows from debt security         $ 9,000        
[1] Derived from restated audited financial statements filed on Form 10-K/A on December 6, 2018