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Equity Investments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity Investments [Abstract]        
Aggregate carrying amount of equity investments $ 41,982 $ 40,587 $ 41,226 $ 38,324
Impairment losses related to cost-method investments $ 1,711 $ 962