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Debt - Summary of long-term debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 30, 2015
Debt Instrument [Line Items]    
Capitalized lease obligations $ 19 $ 18
Long-term debt and capital lease obligations, gross 285,669 287,118
Unamortized debt discount (548) (600)
Long-term debt and capital lease obligations, net 285,121 286,518
Less: current maturities (2,814) (2,809)
Total 282,307 283,709
Term B loan due April 2021    
Debt Instrument [Line Items]    
Long-term debt, gross $ 285,650 $ 287,100