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Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Debt [Abstract] |  |
Total long-term debt | $ 129,905 | $ 126,570
Less discount on issuance of long-term debt | (175) | (181)
Less unamortized debt issuance costs | (2,734) | (2,816)
Long-term portion | 126,996 | 123,573
8.43% Senior Notes, Series D, due 2022 [Member] |  |
Debt [Abstract] |  |
Total 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] |  |
Debt [Abstract] |  |
Total 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] |  |
Debt [Abstract] |  |
Total long-term debt | $ 10,500 | 10,500
Interest rate | 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
Interest rate | 3.10% |
3.23% Senior Notes, due 2040 [Member] |  |
Debt [Abstract] |  |
Total long-term debt | $ 15,000 | 15,000
Interest rate | 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
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% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member] | Maximum [Member] |  |
Debt [Abstract] |  |
Interest rate | 4.50% |
4.54% Senior Notes, due 2049 [Member] |  |
Debt [Abstract] |  |
Total long-term debt | $ 20,000 | 20,000
Interest rate | 4.54% |
3.24% Senior Notes, due 2050 [Member] |  |
Debt [Abstract] |  |
Total long-term debt | $ 30,000 | 30,000
Interest rate | 3.24% |
Committed Line of Credit, due September 2023 [Member] |  |
Debt [Abstract] |  |
Total long-term debt | $ 10,035 | $ 6,700

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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=123466204&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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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 + Details
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