Segment Information (Reportable Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Restructuring Costs and Asset Impairment Charges	$ 2,552	$ 3,826
Net revenues	145,208	150,798
Operating income (loss)	7,354	5,495
Other Operating Income	9,096	11,260
Other Nonrecurring (Income) Expense	(2,268)	776
Restructuring Charges	1,458	1,163
Interest expense	1,669	631
Other income, net	(225)	528
INCOME BEFORE INCOME TAXES	5,460	5,392
Identifiable assets	814,953	671,097	$ 820,756
Capital expenditures	3,001	4,021
Depreciation, Depletion and Amortization	6,890	5,792
Energy [Member]
Segment Reporting Information [Line Items]
Net revenues	80,135	83,409
Operating income (loss)	6,864	9,296
Other Nonrecurring (Income) Expense	(2,268)	887
Restructuring Charges	1,022	(278)
Identifiable assets	652,725	457,708
Capital expenditures	791	922
Depreciation, Depletion and Amortization	3,071	1,526
Aerospace [Member]
Segment Reporting Information [Line Items]
Net revenues	65,073	67,389
Operating income (loss)	7,711	8,452
Identifiable assets	410,218	447,896
Capital expenditures	957	2,222
Depreciation, Depletion and Amortization	3,471	3,941
Corporate/Eliminations [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(5,479)	(6,488)
Identifiable assets	(247,990)	(234,507)
Capital expenditures	484	106
Depreciation, Depletion and Amortization	348	325
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Special Restructuring Charges	1,458	1,163
Special Other Charges	(2,268)	776
Other Nonrecurring (Income) Expense	(810)	1,939
Restructuring Charges		1,958
Special Acquisition Amortization	2,552	1,868
Restatement Adjustment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital expenditures	$ 2,232	$ 3,250