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Investments (Schedule Of Reconciliation Of Changes In Non-Marketable Equity Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Non-marketable Securities |  |  |
Balance at the beginning of the period |  | $ 30,033 |
Impairment of investments |  | 8,476 | $ (2,590)
Carrying value of non-marketable securities |  | 21,410 |
Gain from change of accounting methodology to fair value |  | 8,500 |
Non-marketable Securities [Member] |  |  |
Non-marketable Securities |  |  |
Balance at the beginning of the period |  | 30,033 | 30,436
Investments |  | 1,946 | 2,741
Impairment of investments |  |  | (2,590)
Reclassification to marketable securities | [1] | (10,569) |
Carrying value of non-marketable securities |  | $ 21,410 | $ 30,587
[1] | In September 2020, one of our investments, which was previously accounted for under the measurement alternative, completed its initial public offering which resulted in a change of accounting methodology to fair value and the recognition of an unrealized gain of $8.5 million for the three months ended September 30, 2020.

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