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Commitments And Contingencies (Narrative) (Details)
ZAR in Millions, $ in Millions
Dec. 31, 2016
ZAR
Dec. 31, 2016
USD ($)
Guarantor Obligations [Line Items]    
Maximum payment amount under guarantee ZAR 130.5 $ 9.5
Counter Guarantee [Member]    
Guarantor Obligations [Line Items]    
Guarantee amount ZAR 130.5 $ 9.5
Payment Guarantee [Member] | Minimum [Member]    
Guarantor Obligations [Line Items]    
Charge rate 0.40% 0.40%
Payment Guarantee [Member] | Maximum [Member]    
Guarantor Obligations [Line Items]    
Charge rate 2.00% 2.00%
Nedbank [Member] | Guarantee [Member]    
Guarantor Obligations [Line Items]    
Guarantee amount ZAR 130.5 $ 9.5