Goodwill and Other Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance, beginning	$ 378,920	$ 460,080
Goodwill, Other Changes		(1,180)
Goodwill, Impairment Loss	(60,200)	(74,110)
Foreign currency translation	(3,640)	(5,870)
Balance, ending	315,080	378,920
Packaging [Member]
Goodwill [Roll Forward]
Balance, beginning	165,730	169,350
Goodwill, Acquired During Period		0
Goodwill, Impairment Loss	0	0
Foreign currency translation	(3,640)	(3,620)
Balance, ending	162,090	165,730
Aerospace [Member]
Goodwill [Roll Forward]
Balance, beginning	206,630	210,130
Goodwill, Other Changes		(3,500)
Goodwill, Impairment Loss	(60,200)	0
Foreign currency translation	0	0
Balance, ending	146,430	206,630
Energy [Member]
Goodwill [Roll Forward]
Balance, beginning	0	73,180
Goodwill, Acquired During Period		0
Goodwill, Impairment Loss	0	(70,930)
Foreign currency translation	0	(2,250)
Balance, ending	0	0
Engineered Components [Member]
Goodwill [Roll Forward]
Balance, beginning	6,560	7,420
Goodwill, Acquired During Period		2,320
Goodwill, Impairment Loss	0	(3,180)
Foreign currency translation	0	0
Balance, ending	$ 6,560	$ 6,560