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Equity-Accounted Investments And Other Long-Term Assets (Summary Of Unrealized Gain (Loss) On Investments) (Details) $ in Thousands | Jun. 30, 2018 USD ($)
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Schedule Of Equity And Held To Maturity Investments [Line Items] |
Cost basis | $ 154,714
Unrealized holding gains | 33,868
Carrying value | 183,343
Cell C [Member] |
Schedule Of Equity And Held To Maturity Investments [Line Items] |
Cost basis | 145,714
Unrealized holding gains | 32,473
Carrying value | 172,948
Cedar Cellular [Member] |
Schedule Of Equity And Held To Maturity Investments [Line Items] |
Cost basis | 9,000
Unrealized holding gains | 1,395
Carrying value | $ 10,395

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