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Debt - Summary of long-term debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Jun. 30, 2016
Debt Instrument [Line Items]    
Long-term debt including current maturities $ 282,751 $ 284,207
Unamortized debt issuance costs and debt discount (2,718) (3,035)
Less: current maturities (2,901) (2,907)
Long-term debt 277,132 278,265
Term B loan due April 2021    
Debt Instrument [Line Items]    
Long-term debt including current maturities 282,750 284,200
Capitalized lease obligations    
Debt Instrument [Line Items]    
Long-term debt including current maturities $ 1 $ 7