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Short-Term Borrowings and Long-Term Debt (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
2021 $ 0  
2022 128  
2023 0  
2024 0  
2025 0  
Thereafter 27,174  
Long-term debt, total 27,302 $ 40,370
Fixed-Rate    
Debt Instrument [Line Items]    
2021 0  
2022 128  
2023 0  
2024 0  
2025 0  
Thereafter 174  
Long-term debt, total 302  
Fixed-Rate Convertible    
Debt Instrument [Line Items]    
2021 0  
2022 0  
2023 0  
2024 0  
2025 0  
Thereafter 27,000  
Long-term debt, total 27,000  
Variable Convertible    
Debt Instrument [Line Items]    
2021 0  
2022 0  
2023 0  
2024 0  
2025 0  
Thereafter 0  
Long-term debt, total $ 0