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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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