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Long-Term Debt - Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2019 $ 0  
2020 0  
2021 0  
2022 0  
2023 and thereafter 160,000  
Total debt $ 160,000 $ 70,000