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Equity-Accounted Investments And Other Long-Term Assets (Summary Of Unrealized Gain (Loss) On Investments) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018
Schedule Of Equity And Held To Maturity Investments [Line Items] |  |
Cost basis | $ 35,993 | $ 10,395
Carrying value | 37,591 | 10,395
MobiKwik [Member] |  |
Schedule Of Equity And Held To Maturity Investments [Line Items] |  |
Cost basis | 26,993 |
Carrying value | 26,993 |
Cedar Cellular [Member] |  |
Schedule Of Equity And Held To Maturity Investments [Line Items] |  |
Cost basis | 9,036 | 10,395
Carrying value | 9,036 | $ 10,395
Interest income reclassified to the cost basis | $ 1,400 |

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