Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) $ in Thousands, R in Billions	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 ZAR (R)	Jun. 30, 2018 USD ($)
Cell C [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value				$ 191,300	R 3.5
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment	$ 0	$ 0
Cash, cash equivalents and restricted cash (included in other long term assets)	466	619
Fixed maturity investments (included in cash and cash equivalents)	3,334	5,201
Total assets at fair value	3,800	5,820
Quoted Price In Active Markets For Identical Assets (Level 1) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents and restricted cash (included in other long term assets)	466	619
Fixed maturity investments (included in cash and cash equivalents)	3,334	5,201
Total assets at fair value	3,800	5,820
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment	0	0
Total assets at fair value	$ 0	$ 0	$ 121,941			$ 172,948