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Debt - Summary of long-term debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Debt Disclosure [Abstract]    
Term A Loan due June 2022 $ 237,500 $ 243,750
Capitalized lease obligations 77 118
Long-term debt including current maturities 237,577 243,868
Unamortized debt issuance costs and debt discount (1,301) (1,487)
Long-term debt after debt issuance costs 236,276 242,381
Less: current maturities (12,577) (12,579)
Long-term debt $ 223,699 $ 229,802