Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Net sales	$ 203,320	$ 224,900	$ 406,200	$ 449,030
Operating profit (loss)	18,660	19,210	35,110	42,230
Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	88,110	89,580	168,220	168,540
Operating profit (loss)	21,410	20,710	39,250	38,220
Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	44,090	43,220	84,590	88,960
Operating profit (loss)	3,550	7,220	7,010	15,300
Energy [Member]
Segment Reporting Information [Line Items]
Net sales	39,950	50,150	84,700	101,310
Operating profit (loss)	(3,090)	(7,170)	(6,700)	(6,830)
Engineered Components [Member]
Segment Reporting Information [Line Items]
Net sales	31,170	41,950	68,690	90,220
Operating profit (loss)	3,860	6,220	9,440	12,190
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	$ (7,070)	$ (7,770)	$ (13,890)	$ (16,650)