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Long-term Debt - Summary of long-term debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 999,555 $ 1,074,297
Less unamortized debt issuance costs (5,677) (5,997)
Total long-term debt 993,878 1,068,300
Less current portion (38,965) (38,965)
Long-term debt, net of current portion 954,913 1,029,335
Bank credit facility - Term Loan    
Debt Instrument [Line Items]    
Principal amount of long-term debt 769,555 779,297
Bank credit facility - revolver loans    
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 230,000 $ 295,000