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Equity-Accounted Investments And Other Long-Term Assets (Summary Of Components Of Held To Maturity Investments) (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Schedule Of Equity And Held To Maturity Investments [Line Items]  
Carrying value $ 10,395
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