Derivatives (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Derivative [Line Items]
Unrecognized gains on derivative instruments recorded in earnings within the next twelve months	$ 7
Unrecognized losses on derivative instruments recorded in earnings within the next twelve months	1,528
Net unrecognized gains on derivative instruments	2,655	$ (1,542)
Options | Cash flow hedges
Derivative [Line Items]
Other comprehensive income (loss), unrealized gains (losses) on derivatives	4,197
Realized losses on derivative instruments	2,733
Unrecognized gains (losses) on derivative instruments	(1,205)
Options | Cash flow hedges | Other comprehensive income (loss)
Derivative [Line Items]
Unrecognized gains (losses) on derivative instruments	$ 2,655