Goodwill and Other Intangible Assets Goodwill Rollforward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Roll Forward]
Balance, beginning	$ 334,640
Goodwill, Acquired During Period	43,260
Goodwill reassigned between segments	0
Goodwill, Impairment Loss	(126,840)
Translation and purchase accounting adjustments	810
Balance, ending	251,870
Packaging [Member]
Goodwill [Roll Forward]
Balance, beginning	181,650
Goodwill, Acquired During Period	0
Goodwill reassigned between segments	0
Goodwill, Impairment Loss	0
Translation and purchase accounting adjustments	810
Balance, ending	182,460
Aerospace [Member]
Goodwill [Roll Forward]
Balance, beginning	133,690
Goodwill, Acquired During Period	43,260
Goodwill reassigned between segments	12,740
Goodwill, Impairment Loss	(126,840)
Translation and purchase accounting adjustments	0
Balance, ending	62,850
Specialty Products [Member]
Goodwill [Roll Forward]
Balance, beginning	19,300
Goodwill, Acquired During Period	0
Goodwill reassigned between segments	(12,740)
Goodwill, Impairment Loss	0
Translation and purchase accounting adjustments	0
Balance, ending	$ 6,560