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Contingencies (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2012
Site Contingency [Line Items] |  |
Litigation Settlement, Amount |  | $ 110,000
Environmental Costs Recovered | $ 37,000 |
Huntsville Site [Member] |  |
Site Contingency [Line Items] |  |
Environmental Remediation Expense To Date | 5,900 |
Additional Expected Project Expenditures Low Estimate | 4,400 |
Additional Expected Project Expenditures High Estimate | 10,000 |
Huntsville Site [Member] | Investigation Report [Member] |  |
Site Contingency [Line Items] |  |
Additional Expected Project Expenditures Low Estimate | 300 |
Additional Expected Project Expenditures High Estimate | 600 |
Norco Site [Member] | Remediation, Project Management, Regulatory Oversight, and Investigative and Feasability Studies [Member] |  |
Site Contingency [Line Items] |  |
Environmental Remediation Expense To Date | 55,800 |
Additional Expected Project Expenditures Low Estimate | 19,000 |
Additional Expected Project Expenditures High Estimate | $ 29,800 |

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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 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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