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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |
Environmental remediation liabilities - discounted | $ 42,800 | $ 42,800 | $ 28,100
Accrual for environmental loss contingencies - weighted-average discount rate | 3.70% | 3.70% | 3.60%
Environmental remediation liabilities - undiscounted | $ 85,000 | $ 85,000 | $ 68,200
Legal accrual | (1,017) | 27,027 |
Tax indemnification liability | $ 27,000 | 27,000 | $ 42,700
Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Potential revision on future environmental remediation costs before tax |  | 10,000 |
Maximum |  |  |
Loss Contingencies [Line Items] |  |  |
Potential revision on future environmental remediation costs before tax |  | 25,000 |
2014 Sales Contract |  |  |
Loss Contingencies [Line Items] |  |  |
Legal accrual |  | 16,200 |
Guarantee From Previously Disposed Business |  |  |
Loss Contingencies [Line Items] |  |  |
Legal accrual |  | $ 10,800 |

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- Definition Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date. + 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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