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Long-Term Debt and Short-Term Borrowings, Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Debt [Abstract] |  |
Total long-term debt | $ 208,178 | $ 182,643
Less discount on issuance of long-term debt | (136) | (147)
Less unamortized debt issuance costs | (2,481) | (2,489)
Long-term portion | 205,561 | 180,007
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 | 40,000
Interest rate | 5.50% |
5.67% Senior Notes, due 2054 [Member] |  |
Debt [Abstract] |  |
Total long-term debt | $ 40,000 | 0
Interest rate | 5.67% |
Committed Line of Credit, due September 2026 [Member] |  |
Debt [Abstract] |  |
Total long-term debt | $ 15,808 | $ 30,273

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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