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Short-Term Debt and Long-term Debt (Long Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Weighted Average Rate 1.66% 2.16%
Amount $ 191,161 $ 245,800
Maturing by December 31, 2020 [Member]    
Debt Instrument [Line Items]    
Weighted Average Rate   1.85%
Amount   $ 50,000
Maturing by December 31, 2021 [Member]    
Debt Instrument [Line Items]    
Weighted Average Rate 2.05% 2.19%
Amount $ 53,000 $ 68,000
Maturing by December 31, 2022 [Member]    
Debt Instrument [Line Items]    
Weighted Average Rate 1.49% 2.32%
Amount $ 23,000 $ 67,800
Maturing by December 31, 2023 [Member]    
Debt Instrument [Line Items]    
Weighted Average Rate 1.29% 2.56%
Amount $ 25,000 $ 35,000
Maturing by December 31, 2024 [Member]    
Debt Instrument [Line Items]    
Weighted Average Rate 1.21% 1.75%
Amount $ 47,000 $ 25,000
Maturing by December 31, 2025 [Member]    
Debt Instrument [Line Items]    
Weighted Average Rate 1.96%  
Amount $ 43,161