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Goodwill and Other Intangible Assets - Goodwill Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016
Goodwill [Line Items] |  |  |  |
Goodwill, Impairment Loss |  |  |  | $ 60,200
Aerospace Reporting Unit [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Impairment Loss |  | $ 60,200 |  |
Energy Reporting Unit [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Impairment Loss |  |  | $ 70,900 |
Engine Products Reporting Unit [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Impairment Loss |  |  | $ 3,200 |
Goodwill [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Income-Based Approach |  |  | 75.00% |
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Market-Based Approach |  |  | 25.00% |
Fair Value Inputs, Long-term Revenue Growth Rate |  |  | 3.00% |
Goodwill [Member] | Maximum [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  |  | 14.50% |
Goodwill [Member] | Minimum [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Fair Value Inputs, Discount Rate |  |  | 11.00% |
Goodwill [Member] | Aerospace Reporting Unit [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Income-Based Approach | 50.00% | 50.00% |  | 50.00%
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Market-Based Approach | 50.00% | 50.00% |  | 50.00%
Fair Value Inputs, Discount Rate | 9.50% | 10.30% |  |
Fair Value Inputs, Long-term Revenue Growth Rate | 3.00% | 3.00% |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 15.00% |  |  |

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Percentage of assumed long-term growth in revenues, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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