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Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Investments [Abstract]          
Net unrealized gains (losses) $ (3,700) $ (2,800) $ 4,800 $ (5,400)  
Aggregate carrying amount of equity investments 21,410   21,410   $ 30,033
Impairment losses related to equity investments     (4,776) $ 5,419  
Carrying value of equity method investments $ 21,681   $ 21,681   $ 14,109