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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

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