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Long-Term Debt and Short-Term Borrowings, Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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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

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