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Short-Term Borrowings and Long-Term Debt (Schedule of Maturities of Long-term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Due in 2018 $ 20,000  
Due in 2019 13,000  
Due in 2020 2,188  
Due in 2021 0  
Due in 2022 5,000  
Thereafter 182  
Long-term debt, total 40,370 $ 20,436
Fixed Rate [Member]    
Debt Instrument [Line Items]    
Due in 2018 20,000  
Due in 2019 13,000  
Due in 2020 2,188  
Due in 2021 0  
Due in 2022 5,000  
Thereafter 182  
Long-term debt, total 40,370  
Fixed Rate Convertible [Member]    
Debt Instrument [Line Items]    
Due in 2018 0  
Due in 2019 0  
Due in 2020 0  
Due in 2021 0  
Due in 2022 0  
Thereafter 0  
Long-term debt, total 0  
Variable Convertible [Member]    
Debt Instrument [Line Items]    
Due in 2018 0  
Due in 2019 0  
Due in 2020 0  
Due in 2021 0  
Due in 2022 0  
Thereafter 0  
Long-term debt, total $ 0