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, 2020	Jun. 30, 2020
Schedule Of Equity And Held To Maturity Investments [Line Items]
Cost basis	$ 26,993	$ 26,993
Unrealized holding gains	15,128	0
Unrealized holding losses	0	0
Carrying value	42,121	26,993
MobiKwik [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Cost basis	26,993	26,993
Unrealized holding gains	15,128	0
Unrealized holding losses	0	0
Carrying value	42,121	26,993
Cedar Cellular [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Cost basis	0	0
Unrealized holding gains	0	0
Unrealized holding losses	0	0
Carrying value	0	0
CPS [Member]
Schedule Of Equity And Held To Maturity Investments [Line Items]
Cost basis	0	0
Unrealized holding gains	0	0
Unrealized holding losses	0	0
Carrying value	$ 0	$ 0

Schedule Of Equity And Held To Maturity Investments [Line Items]

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Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests.

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Cost of investments in equity securities and other forms of securities that provide ownership interests classified as trading.

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Amount of unrealized holding gain before loss recognized in the income statement for investments in trading securities.

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Amount of unrealized holding loss before gain recognized in the income statement for investments in trading securities.

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