Segment Information (Reportable Segment Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net revenues	$ 205,398	$ 214,280
Inter-segment revenues	0	0
Operating income (loss)	12,900	13,700
Interest income	(43)	(83)
Interest expense	830	1,164
Other income, net	612	138
INCOME BEFORE INCOME TAXES	11,501	12,481
Identifiable assets	704,110	720,533	709,981
Capital expenditures	4,707	4,122
Depreciation and amortization	4,767	4,972
Energy [Member]
Segment Reporting Information [Line Items]
Net revenues	96,722	109,264
Inter-segment revenues	364	396
Operating income (loss)	10,137	8,928
Identifiable assets	396,339	379,950
Capital expenditures	1,851	730
Depreciation and amortization	1,636	1,987
Aerospace [Member]
Segment Reporting Information [Line Items]
Net revenues	37,326	38,085
Inter-segment revenues	5	26
Operating income (loss)	394	4,124
Identifiable assets	179,306	195,823
Capital expenditures	1,489	882
Depreciation and amortization	1,216	1,249
Flow Technologies [Member]
Segment Reporting Information [Line Items]
Net revenues	71,350	66,931
Inter-segment revenues	230	192
Operating income (loss)	8,957	7,587
Identifiable assets	210,860	193,468
Capital expenditures	1,273	2,330
Depreciation and amortization	1,535	1,431
Corporate/Eliminations [Member]
Segment Reporting Information [Line Items]
Net revenues	0	0
Inter-segment revenues	(599)	(614)
Operating income (loss)	(6,588)	(6,939)
Identifiable assets	(82,396)	(48,708)
Capital expenditures	94	180
Depreciation and amortization	380	305
Corporate Identifiable Assets After Elimination Of Intercompany Assets [Member]
Segment Reporting Information [Line Items]
Identifiable assets	$ 42,000	$ 42,500