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Fair Value Of Financial Instruments (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment in Cell C   $ 172,948  
Cash and cash equivalents (included in other long-term assets) $ 619 610  
Fixed maturity investments (included in cash and cash equivalents) 5,201 8,304  
Other 413 18  
Total assets at fair value 6,233 181,880  
DNI contingent consideration (Note 3)   27,222  
Total liabilities at fair value   27,222  
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 and cash equivalents (included in other long-term assets) 619 610  
Fixed maturity investments (included in cash and cash equivalents) 5,201 8,304  
Total assets at fair value 5,820 8,914  
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other 413 18  
Total assets at fair value 413 18  
Significant Unobservable Inputs (Level 3) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets at fair value 172,948 $ 151,003
Total liabilities at fair value 27,222  
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment in Cell C   172,948  
Total assets at fair value   172,948  
DNI contingent consideration (Note 3)   27,222  
Total liabilities at fair value   $ 27,222