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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Commitments and contingencies |  |  |
Environmental Remediation Expense | $ 0 | $ 1,500,000 |
Indemnification agreements |  |  |
Commitments and contingencies |  |  |
Liabilities recorded under indemnification agreements | 0 |  | $ 0
Minimum |  |  |
Commitments and contingencies |  |  |
Environmental Loss Contingencies Estimate | 1,500,000 |  |
Maximum |  |  |
Commitments and contingencies |  |  |
Environmental Loss Contingencies Estimate | $ 3,000,000 |  |

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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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