Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Maturities of Long-term Debt (Details)

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Long-Term Debt - Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 $ 9,088  
2019 0  
2020 0  
2021 0  
2022 and thereafter 80,000  
Total debt $ 89,088 $ 72,942