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Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt [Abstract]
Total long-term debt	$ 214,213	$ 208,178
Less discount on issuance of long-term debt	(133)	(136)
Less unamortized debt issuance costs	(2,437)	(2,481)
Long-term portion	211,643	205,561
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	40,000
Interest rate	5.67%
Committed Line of Credit, due September 2026 [Member]
Debt [Abstract]
Total long-term debt	$ 21,843	$ 15,808

X

- 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.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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