Long-term Debt - Effect of derivative instruments (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Long-Term Debt [Abstract]
Gain (loss) recognized in other comprehensive income	$ (5,621)	$ (5,050)	$ (9,637)	$ (9,064)
Amounts reclassified to earnings from accumulated other comprehensive loss	2,040	1,908	6,854	5,104
Net current period other comprehensive income (loss)	$ (3,581)	$ (3,142)	$ (2,783)	$ (3,960)