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%