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Dividends (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dividends [Line Items]    
Cash dividends paid $ 3,910 $ 3,896
Class A common stock    
Dividends [Line Items]    
Cash dividends paid 3,910  
Class B common stock    
Dividends [Line Items]    
Cash dividends paid $ 3,910