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Long-Term Debt and Short-Term Borrowings, Fixed Rate Long-Term Debt (Details) - USD ($) $ in Thousands					12 Months Ended
	Sep. 30, 2020	Oct. 08, 2019	Oct. 01, 2019	Jan. 31, 2019	Dec. 31, 2020
3.24% Senior Notes, due 2050 [Member]
Long-Term Debt [Abstract]
Face value					$ 30,000
Interest rate					3.24%
Maturity date					Sep. 30, 2050
Proceeds from debt, net of issuance costs	$ 29,838
10.05% Senior Notes, Series C, due 2020 [Member]
Long-Term Debt [Abstract]
Face value	$ 6,500
Interest rate	10.05%				10.05%
Maturity date					Sep. 30, 2020
4.54% Senior Notes, due 2049 [Member]
Long-Term Debt [Abstract]
Face value				$ 20,000
Interest rate				4.54%	4.54%
Maturity date					Jan. 31, 2049
Proceeds from debt, net of issuance costs				$ 19,820
10.17% Series A Senior Notes and 9.60% Series B Senior Notes [Member]
Long-Term Debt [Abstract]
Face value				$ 11,000
10.17% Senior Notes, Series A, due 2019 [Member]
Long-Term Debt [Abstract]
Interest rate				10.17%
Maturity date					Feb. 01, 2019
9.60% Senior Notes, Series B, due 2019 [Member]
Long-Term Debt [Abstract]
Interest rate				9.60%
Maturity date					Feb. 01, 2019
3.23% Senior Notes, due 2040 [Member]
Long-Term Debt [Abstract]
Face value			$ 15,000
Interest rate			3.23%		3.23%
Maturity date					Oct. 01, 2040
Proceeds from debt, net of issuance costs			$ 14,888
5.00% Monthly Senior Notes, Series 2010A, due 2040 [Member]
Long-Term Debt [Abstract]
Face value			$ 15,000
Interest rate			5.00%
Maturity date					Oct. 01, 2040
3.00% Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series A of 2019, due 2036 [Member]
Long-Term Debt [Abstract]
Face value		$ 10,500
Interest rate		3.00%			3.00%
Maturity date					Oct. 01, 2036
3.10% Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series B of 2019, due 2038 [Member]
Long-Term Debt [Abstract]
Face value		$ 14,870
Interest rate		3.10%			3.10%
Maturity date					Nov. 01, 2038
Series A and Series B Bonds [Member]
Long-Term Debt [Abstract]
Proceeds from debt, net of issuance costs		$ 25,049
4.75% York County Industrial Development Authority Revenue Bonds, Series 2006, due 2036 [Member]
Long-Term Debt [Abstract]
Face value		$ 10,500
Interest rate		4.75%
Maturity date					Oct. 01, 2036
4.50% PEDFA Exempt Facilities Revenue Refunding Bonds, Series 2014, due 2038 [Member]
Long-Term Debt [Abstract]
Face value		$ 14,870
Interest rate		4.50%
Maturity date					Nov. 01, 2038

X

- Definition

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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