Goodwill and Other Intangible Assets Goodwill Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill	$ 332,670		$ 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%