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Long-Term Debt (Future maturities of long-term debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Long-Term Debt.    
2020 $ 0  
2021 0  
2022 10,000  
2023 0  
2024 0  
Thereafter 0  
Long-term Debt, Total $ 10,000 $ 10,000