Investments (Schedule Of Reconciliation Of Changes In Non-Marketable Equity Investments) (Details) - USD ($) $ in Thousands		3 Months Ended
		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.