Goodwill and Other Intangible Assets Goodwill Rollforward (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill [Roll Forward]
Balance, beginning	$ 315,080
Translation and purchase accounting adjustments	2,770
Balance, ending	317,850
Packaging [Member]
Goodwill [Roll Forward]
Balance, beginning	162,090
Translation and purchase accounting adjustments	2,770
Balance, ending	164,860
Energy [Member]
Goodwill [Roll Forward]
Balance, beginning	0
Translation and purchase accounting adjustments	0
Balance, ending	0
Aerospace [Member]
Goodwill [Roll Forward]
Balance, beginning	146,430
Translation and purchase accounting adjustments	0
Balance, ending	146,430
Engineered Components [Member]
Goodwill [Roll Forward]
Balance, beginning	6,560
Translation and purchase accounting adjustments	0
Balance, ending	$ 6,560