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Long-Term Debt - Scheduled Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Debt Disclosure [Abstract]    
2019 $ 12,963  
2020 10,370  
2021 10,370  
2022 10,370  
2023 and thereafter 1,132,927  
Total long term debt 1,177,000  
Less: Current maturities 12,963 $ 14,600
Less: Original issue discount 2,712  
Less: Financing costs 20,046  
Long-term debt, net $ 1,141,279 $ 1,574,882