Disposal Of Controlling Interest In FIHRST (Narrative) (Details) - Dec. 31, 2019 $ in Thousands, R in Millions	USD ($)	ZAR (R)
FIHRST [Member]
Consideration received	$ 11,749	R 172.2

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

No definition available.

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant