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Goodwill and Other Intangible Assets Goodwill Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |
Goodwill | $ 325,520 | $ 316,650
Aerospace Reporting Unit [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 133,700 |
Machined Products Reporting Unit [Member] |  |
Goodwill [Line Items] |  |
Goodwill | $ 12,700 |
Goodwill [Member] | Aerospace Reporting Unit [Member] |  |
Goodwill [Line Items] |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 34.00% |
Goodwill [Member] | Machined Products Reporting Unit [Member] |  |
Goodwill [Line Items] |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 13.00% |
Measurement Input, Long-term Revenue Growth Rate [Member] | Goodwill [Member] | Aerospace Reporting Unit [Member] |  |
Goodwill [Line Items] |  |
Fair value inputs, valuation method, residual growth rate | 3.00% |
Measurement Input, Long-term Revenue Growth Rate [Member] | Goodwill [Member] | Machined Products Reporting Unit [Member] |  |
Goodwill [Line Items] |  |
Fair value inputs, valuation method, residual growth rate | 3.00% |
Measurement Input, Discount Rate [Member] | Goodwill [Member] | Aerospace Reporting Unit [Member] |  |
Goodwill [Line Items] |  |
Fair value inputs, valuation method, discount rate | 9.50% |
Measurement Input, Discount Rate [Member] | Goodwill [Member] | Machined Products Reporting Unit [Member] |  |
Goodwill [Line Items] |  |
Fair value inputs, valuation method, discount rate | 10.50% |

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