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Investments (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Investments [Abstract]        
Aggregate carrying amount of equity investments $ 62,859 $ 39,795 $ 41,226 $ 38,324
Impairment losses related to cost-method investments $ 2,959 $ 2,254