Long-term Debt - Effect of derivative instruments (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Long-Term Debt [Abstract]
Gain (loss) recognized in other comprehensive income	$ 1,440	$ (4,219)	$ (4,016)	$ (4,014)
Amounts reclassified to earnings from accumulated other comprehensive loss	2,392	1,598	4,814	3,196
Net current period other comprehensive income (loss)	$ 3,832	$ (2,621)	$ 798	$ (818)