Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Segment Reporting Information [Line Items]
Operating Profit (Loss)	$ (4,250)	$ 86,650		$ 97,210
Capital Expenditures	28,660	23,000		24,230
Operating Net Assets	1,017,550	1,318,470		1,007,480
Current Liabilities	152,750	306,960		261,510
Assets	1,170,300	1,625,430		1,268,990
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	863,980	887,300		799,700
Operating Profit (Loss)	(4,250)	86,650		97,210
Capital Expenditures	28,660	23,000		24,230
Depreciation and Amortization	43,540	37,440		31,100
Operating Net Assets	1,017,550	1,105,110	[1]	766,790	[1]
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Operating Net Assets	0	213,360		240,690
Packaging [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	334,270	337,710		313,220
Operating Profit (Loss)	78,470	77,850		83,770
Capital Expenditures	13,670	13,730		11,010
Depreciation and Amortization	20,920	20,410		18,960
Operating Net Assets	380,630	398,530		377,480
Aerospace [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	176,480	121,510		95,530
Operating Profit (Loss)	28,320	17,830		22,830
Capital Expenditures	5,010	4,430		4,810
Depreciation and Amortization	13,290	7,630		3,790
Operating Net Assets	494,570	498,560		150,750
Energy [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	193,390	206,720		205,580
Operating Profit (Loss)	(97,160)	(6,660)		8,620
Capital Expenditures	7,610	2,690		5,250
Depreciation and Amortization	4,790	4,600		3,820
Operating Net Assets	90,880	170,430		180,410
Engineered Components [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Net Sales	159,840	221,360		185,370
Operating Profit (Loss)	18,240	34,080		19,450
Capital Expenditures	2,320	1,690		2,190
Depreciation and Amortization	4,200	4,460		4,270
Operating Net Assets	67,460	65,910		73,780
Corporate [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Profit (Loss)	(32,120)	(36,450)		(37,460)
Capital Expenditures	50	460		970
Depreciation and Amortization	340	340		260
Operating Net Assets	$ (15,990)	$ (28,320)		$ (15,630)

[1] Excludes discontinued operations. See Note 6, "Discontinued Operations".