Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net sales	$ 202,290	$ 222,190	$ 608,490	$ 671,220
Operating profit (loss)	17,790	21,560	52,900	63,790
Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	90,330	87,930	258,550	256,470
Operating profit (loss)	20,090	21,870	59,340	60,090
Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	47,430	45,380	132,020	134,340
Operating profit (loss)	6,660	7,110	13,670	22,410
Energy [Member]
Segment Reporting Information [Line Items]
Net sales	38,230	51,600	122,930	152,910
Operating profit (loss)	(1,870)	(3,560)	(8,570)	(10,390)
Engineered Components [Member]
Segment Reporting Information [Line Items]
Net sales	26,300	37,280	94,990	127,500
Operating profit (loss)	3,180	4,380	12,620	16,570
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	$ (10,270)	$ (8,240)	$ (24,160)	$ (24,890)