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Debt - Summary of long-term debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Jun. 30, 2014
Debt Instrument [Line Items]    
Long-term debt including current maturities $ 287,118 $ 290,094
Unamortized debt discount (600) (703)
Long-Term Debt less Unamortized debt discount 286,518 289,391
Less: current maturities (2,809) (2,969)
Long-term debt 283,709 286,422
Term B loan due April 2021    
Debt Instrument [Line Items]    
Long-term debt including current maturities 287,100 290,000
Capitalized lease obligations    
Debt Instrument [Line Items]    
Long-term debt including current maturities $ 18 $ 94