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Long-Term Debt, Schedule of Aggregate Payments Due on The Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long-Term Debt [Abstract]    
2019 $ 19  
2020 150,000  
2021 0  
2022 417,373  
2023 350,000  
Thereafter 500,000  
Long-term Debt $ 1,417,392 $ 995,848