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Long-Term Debt, Maturities of Long-Term Debt (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Maturities of Long-term Debt [Abstract]  
2018 $ 77,840
2019 113,928
2020 210,000
2021 0
2022 0
Thereafter 0
Total 401,768 [1]
Unamortized debt discount and debt issuance costs $ 13,100
[1] The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $13.1 million, which is not reflected in this table.