Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 202,880	$ 224,130
Operating profit (loss)	16,450	23,020
Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	80,110	78,960
Operating profit (loss)	17,840	17,510
Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	40,500	45,740
Operating profit (loss)	3,460	8,080
Energy [Member]
Segment Reporting Information [Line Items]
Net sales	44,750	51,160
Operating profit (loss)	(3,610)	340
Engineered Components [Member]
Segment Reporting Information [Line Items]
Net sales	37,520	48,270
Operating profit (loss)	5,580	5,970
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	$ (6,820)	$ (8,880)