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Dividends (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Dividends [Line Items]      
Cash dividends paid   $ 11,767 $ 11,692
Class A common stock      
Dividends [Line Items]      
Cash dividends paid $ 3,940 11,767  
Class B common stock      
Dividends [Line Items]      
Cash dividends paid $ 3,940 $ 11,767