Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating Profit (Loss)	$ (44,000)	$ (4,250)	$ 86,650
Capital Expenditures	31,330	28,660	23,000
Assets	1,051,650	1,170,300	1,625,430
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	794,020	863,980	887,300
Operating Profit (Loss)	(44,000)	(4,250)	86,650
Capital Expenditures	31,330	28,660	23,000
Depreciation and Amortization	44,860	43,540	37,440
Assets	1,051,650	1,170,300	1,292,170
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Assets	0	0	333,260
Packaging [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	341,340	334,270	337,710
Operating Profit (Loss)	77,840	78,470	77,850
Capital Expenditures	19,880	13,670	13,730
Depreciation and Amortization	22,120	20,920	20,410
Assets	423,460	418,810	436,690
Aerospace [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	174,920	176,480	121,510
Operating Profit (Loss)	(90,810)	28,320	17,830
Capital Expenditures	3,950	5,010	4,430
Depreciation and Amortization	14,090	13,290	7,630
Assets	409,040	517,820	525,340
Energy [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	158,990	193,390	206,720
Operating Profit (Loss)	(13,840)	(97,160)	(6,660)
Capital Expenditures	2,800	7,610	2,690
Depreciation and Amortization	4,280	4,790	4,600
Assets	100,590	128,170	210,420
Engineered Components [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	118,770	159,840	221,360
Operating Profit (Loss)	15,300	18,240	34,080
Capital Expenditures	4,670	2,320	1,690
Depreciation and Amortization	4,090	4,200	4,460
Assets	78,570	88,320	100,560
Corporate [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Profit (Loss)	(32,490)	(32,120)	(36,450)
Capital Expenditures	30	50	460
Depreciation and Amortization	280	340	340
Assets	$ 39,990	$ 17,180	$ 19,160