Goodwill and Other Intangible Assets Goodwill Rollforward (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Goodwill [Roll Forward]
Balance, beginning	$ 316,650
Goodwill, Acquired During Period	9,100
Goodwill reassigned between segments	0
Translation and purchase accounting adjustments	(230)
Balance, ending	325,520
Packaging [Member]
Goodwill [Roll Forward]
Balance, beginning	163,660
Goodwill, Acquired During Period	9,100
Goodwill reassigned between segments	0
Translation and purchase accounting adjustments	(230)
Balance, ending	172,530
Aerospace [Member]
Goodwill [Roll Forward]
Balance, beginning	146,430
Goodwill, Acquired During Period	0
Goodwill reassigned between segments	(12,740)
Translation and purchase accounting adjustments	0
Balance, ending	133,690
Specialty Products [Member]
Goodwill [Roll Forward]
Balance, beginning	6,560
Goodwill, Acquired During Period	0
Goodwill reassigned between segments	12,740
Translation and purchase accounting adjustments	0
Balance, ending	$ 19,300