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Fair Value Of Financial Instruments (Narrative) (Details)
$ in Thousands, ZAR in Millions
3 Months Ended 6 Months Ended
Oct. 07, 2016
ZAR
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 07, 2016
USD ($)
Derivatives, Fair Value [Line Items]            
Years of significant fluctuation of US Dollar to ZAR exchange rate       3 years    
Transfers in or out of Level 3   $ 0 $ 0 $ 0 $ 0  
Impairment charges       $ 0    
Finbond [Member]            
Derivatives, Fair Value [Line Items]            
Loan amount ZAR 139.2         $ 10,000
Margin added on rate 10.00%          
Finbond [Member] | LIBOR [Member]            
Derivatives, Fair Value [Line Items]            
Interest rate   0.7717%   0.7717%