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Long-term Debt - Effect of derivative instruments (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Long-Term Debt [Abstract]    
Gain (loss) recognized in other comprehensive income $ (5,456) $ 205
Amounts reclassified to earnings from accumulated other comprehensive loss 2,422 1,598
Net current period other comprehensive income (loss) $ (3,034) $ 1,803