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Debt (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2021
Debt [Abstract]
Total long-term debt	$ 126,977		$ 149,190
Less discount on issuance of long-term debt	(161)		(169)
Less unamortized debt issuance costs	(2,528)		(2,652)
Less current maturities	(7,500)		(7,500)
Long-term portion	116,788		138,869
8.43% Senior Notes, Series D, due 2022 [Member]
Debt [Abstract]
Total long-term debt	$ 7,500		7,500
Interest rate	8.43%
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%
Committed Line of Credit, due September 2024 [Member]
Debt [Abstract]
Total long-term debt	$ 7,107		$ 29,320
Committed Line of Credit, due September 2024 [Member] | LIBOR [Member]
Debt [Abstract]
Basis adjustment	1.05%
Committed Line of Credit, due September 2024 [Member] | SOFR [Member] | Plan [Member]
Debt [Abstract]
Basis adjustment		1.17%

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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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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