Dividends (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Dividends [Line Items]
Cash dividends paid	$ 3,917	$ 7,827	$ 7,791
Class A common stock
Dividends [Line Items]
Cash dividends paid	3,917	7,827
Class B common stock
Dividends [Line Items]
Cash dividends paid	$ 3,917	$ 7,827