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Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2012
Site Contingency [Line Items] |  |
Proceeds from Legal Settlements |  | $ 110,000
Recovery of Direct Costs | $ 37,000 |
Huntsville Site [Member] |  |
Site Contingency [Line Items] |  |
Environmental Remediation Expense To Date | 6,200 |
Additional Expected Project Expenditures Low Estimate | 4,200 |
Additional Expected Project Expenditures High Estimate | 10,000 |
Groundwater Removal [Member] | Norco Site [Member] |  |
Site Contingency [Line Items] |  |
Environmental Remediation Expense To Date | 69,300 |
Additional Expected Project Expenditures Low Estimate | 12,500 |
Additional Expected Project Expenditures High Estimate | $ 23,200 |

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- Definition High-end of the range estimate of the loss exposure for reasonably possible environmental contingencies at an individual site. + References No definition available. + Details
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- Definition Low-end of the range estimate of the loss exposure for reasonably possible environmental contingencies at an individual site. + References No definition available. + Details
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- Definition Environmental Remediation Expense To Date. + References No definition available. + Details
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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition Return of or reimbursements received in relation to direct costs and expenses previously paid or incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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