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Debt (Details) - USD ($) $ in Thousands		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Debt [Abstract]
Total long-term debt	$ 119,870	$ 119,870	$ 104,042
Less discount on issuance of long-term debt	(184)	(184)	(192)
Less unamortized debt issuance costs	(2,857)	(2,857)	(2,815)
Less current maturities	0	0	(6,500)
Long-term portion	116,829	116,829	94,535
10.05% Senior Notes, Series C, due 2020 [Member]
Debt [Abstract]
Total long-term debt	$ 0	$ 0	6,500
Interest rate	10.05%	10.05%
Face value	$ 6,500	$ 6,500
Maturity date		Sep. 30, 2020
8.43% Senior Notes, Series D, due 2022 [Member]
Debt [Abstract]
Total long-term debt	$ 7,500	$ 7,500	7,500
Interest rate	8.43%	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	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	10,500
Interest rate	3.00%	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	14,870
Interest rate	3.10%	3.10%
3.23% Senior Notes, due 2040 [Member]
Debt [Abstract]
Total long-term debt	$ 15,000	$ 15,000	15,000
Interest rate	3.23%	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	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%
4.00% - 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%	4.50%
4.54% Senior Notes, due 2049 [Member]
Debt [Abstract]
Total long-term debt	$ 20,000	$ 20,000	20,000
Interest rate	4.54%	4.54%
3.24% Senior Notes, due 2050 [Member]
Debt [Abstract]
Total long-term debt	$ 30,000	$ 30,000	0
Interest rate	3.24%	3.24%
Face value	$ 30,000	$ 30,000
Maturity date		Sep. 30, 2050
Proceeds from debt, net of issuance costs	29,838
Committed Line of Credit, due 2022 [Member]
Debt [Abstract]
Total long-term debt	0	$ 0	$ 7,672
Borrowing capacity	$ 50,000	$ 50,000
Committed Line of Credit, due 2022 [Member] | LIBOR [Member]
Debt [Abstract]
Basis adjustment		1.05%

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