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Equity-Accounted Investments And Other Long-Term Assets (Summary Of Unrealized Gain (Loss) On Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018
Schedule Of Equity And Held To Maturity Investments [Line Items] |  |
Cost basis | $ 9,000 | $ 9,000
Unrealized holding gains | 1,551 | 1,395
Unrealized holding losses |  |
Carrying value | 10,551 | 10,395
Cedar Cellular [Member] |  |
Schedule Of Equity And Held To Maturity Investments [Line Items] |  |
Cost basis | 9,000 | 9,000
Unrealized holding gains | 1,551 | 1,395
Unrealized holding losses |  |
Carrying value | $ 10,551 | $ 10,395

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- Details
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