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Long-Term Debt and Short-Term Borrowings, Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt [Abstract]    
Total long-term debt $ 182,643 $ 142,110
Less discount on issuance of long-term debt (147) (158)
Less unamortized debt issuance costs (2,489) (2,487)
Long-term portion 180,007 139,465
Variable Rate Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series 2008A, due 2029 [Member]    
Debt [Abstract]    
Total long-term debt 12,000 12,000
3.00% Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series A of 2019, due 2036 [Member]    
Debt [Abstract]    
Total long-term debt $ 10,500 10,500
Interest rate 3.00%  
3.10% Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series B of 2019, due 2038 [Member]    
Debt [Abstract]    
Total long-term debt $ 14,870 14,870
Interest rate 3.10%  
3.23% Senior Notes, due 2040 [Member]    
Debt [Abstract]    
Total long-term debt $ 15,000 15,000
Interest rate 3.23%  
4.00% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member]    
Debt [Abstract]    
Total long-term debt $ 10,000 10,000
4.00% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member] | Minimum [Member]    
Debt [Abstract]    
Interest rate 4.00%  
4.00% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member] | Maximum [Member]    
Debt [Abstract]    
Interest rate 4.50%  
4.54% Senior Notes, due 2049 [Member]    
Debt [Abstract]    
Total long-term debt $ 20,000 20,000
Interest rate 4.54%  
3.24% Senior Notes, due 2050 [Member]    
Debt [Abstract]    
Total long-term debt $ 30,000 30,000
Interest rate 3.24%  
5.50% Senior Notes, due 2053 [Member]    
Debt [Abstract]    
Total long-term debt $ 40,000 0
Interest rate 5.50%  
Committed Line of Credit, due 2025 [Member]    
Debt [Abstract]    
Total long-term debt $ 30,273 $ 29,740