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Long-Term Debt and Short-Term Borrowings, Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Oct. 08, 2019 | Oct. 01, 2019 | Jan. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Long-term Debt [Abstract] |  |  |  |  |  |
Long-term debt | $ 126,570 |  | $ 104,042 |  |  |
Less discount on issuance of long-term debt | (181) |  | (192) |  |  |
Less unamortized debt issuance costs | (2,816) |  | (2,815) |  |  |
Less current maturities | 0 |  | (6,500) |  |  |
Long-term portion | 123,573 |  | 94,535 |  |  |
10.05% Senior Notes, Series C, due 2020 [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Long-term debt | $ 0 |  | 6,500 |  |  |
Interest rate | 10.05% | 10.05% |  |  |  |
8.43% Senior Notes, Series D, due 2022 [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
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] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
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] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Long-term debt | $ 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] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Long-term debt | $ 14,870 |  | 14,870 |  |  |
Interest rate | 3.10% |  |  | 3.10% |  |
3.23% Senior Notes, due 2040 [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Long-term debt | $ 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] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
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] |  |  |  |  |  |
Long-term 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] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Interest rate | 4.50% |  |  |  |  |
4.54% Senior Notes, due 2049 [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Long-term debt | $ 20,000 |  | 20,000 |  |  |
Interest rate | 4.54% |  |  |  |  | 4.54%
3.24% Senior Notes, due 2050 [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Long-term debt | $ 30,000 |  | 0 |  |  |
Interest rate | 3.24% |  |  |  |  |
Committed Line of Credit, due 2022 [Member] |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |
Long-term debt | $ 6,700 |  | $ 7,672 |  |  |

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