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Debt (Details) - USD ($) $ in Thousands	Feb. 24, 2023	Jun. 30, 2023	Dec. 31, 2022
Debt [Abstract]
Total long-term debt		$ 160,497	$ 142,110
Less discount on issuance of long-term debt		(152)	(158)
Less unamortized debt issuance costs		(2,574)	(2,487)
Long-term portion		157,771	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%
Face value	$ 40,000
Proceeds from debt, net of issuance costs	$ 39,829
Committed Line of Credit, due September 2024 [Member]
Debt [Abstract]
Total long-term debt		$ 8,127	$ 29,740

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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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Face (par) amount of debt instrument at time of issuance.

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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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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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