Goodwill and Other Intangible Assets Goodwill Rollforward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill [Roll Forward]
Balance, beginning	$ 315,080
Translation and purchase accounting adjustments	3,650
Balance, ending	318,730
Packaging [Member]
Goodwill [Roll Forward]
Balance, beginning	162,090
Translation and purchase accounting adjustments	3,650
Balance, ending	165,740
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