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COMMITMENTS AND CONTINGENCIES (Tables) | 6 Months Ended
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Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract] |
Summary of Environmental Liability | A summary of the changes to the aggregate environmental remediation liabilities for the six months ended June 30, 2022 and 2021 follows:
| Six Months Ended June 30,
| 2022 |  | 2021
Beginning balance | $ | 5,887 |  |  | $ | 5,200 |
Accretion expense | 54 |  |  | 56 |
Obligations settled (1) | (72) |  |  | (281) |
Ending balance | 5,869 |  |  | 4,975 |
Less: current portion | 280 |  |  | 375 |
Long-term portion | $ | 5,589 |  |  | $ | 4,600 |
(1)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.

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- Definition Tabular disclosure of environmental loss contingencies by individual site. Does not include loss contingencies that are not environmental in nature. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI https://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q2) -URI https://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(3) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 + Details
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