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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |
Current Portion of Environmental Liabilities | $ 7,066,000 | $ 6,933,000
Long-term environmental liabilities | 29,046,000 | 29,424,000
Total environmental liabilities | $ 36,112,000 | $ 36,357,000

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- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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