Segment Information (Reportable Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 242,638	$ 237,052	$ 245,768	$ 238,855	$ 266,716	$ 247,209	$ 259,658	$ 239,887		$ 964,313	$ 1,013,470	$ 505,492
Operating income (loss)										37,681	21,653	16,307
Other Operating Income										109,800	101,867	43,271
Special Charges, Net										17,686	13,061	7,330
Special charges										17,686	13,061	7,330
Restructuring related inventory charges									$ 16,910	5,186	5,848	2,559
Amortization of inventory step-up										0	6,600	4,300
Restructuring Costs and Asset Impairment Charges										49,247	61,305	17,075
Interest expense												10,841
Interest Income (Expense), Net										(48,609)	(52,975)	(10,841)
Other income, net										(836)	(7,426)	1,826
Income before income taxes										(10,092)	(23,896)	3,640
Identifiable assets	1,470,945				1,791,612				1,906,799	1,470,945	1,791,612	1,906,799
Capital expenditures										13,855	20,114	12,814
Depreciation and amortization										69,636	75,411	27,034
Energy Segment
Segment Reporting Information [Line Items]
Revenues										240,982	288,877	183,399
Operating income (loss)										30,394	38,779	21,708
Special charges										(3,348)	1,907	(11,596)
Restructuring related inventory charges										(1,181)	3,661	54
Identifiable assets	355,870				882,630				837,492	355,870	882,630	837,492
Capital expenditures										1,766	4,814	2,631
Depreciation and amortization										11,012	13,785	9,515
Aerospace Segment
Segment Reporting Information [Line Items]
Revenues										272,625	237,017	182,983
Operating income (loss)										52,480	36,047	23,375
Identifiable assets	426,405				399,102				375,094	426,405	399,102	375,094
Capital expenditures										4,376	4,739	3,400
Depreciation and amortization										11,531	10,937	4,325
Fluid Handling [Member]
Segment Reporting Information [Line Items]
Revenues										450,706	487,576	139,110
Operating income (loss)										52,188	57,340	19,932
Identifiable assets	1,405,056				1,279,048				1,408,217	1,405,056	1,279,048	1,408,217
Capital expenditures										5,757	9,813	5,928
Depreciation and amortization										46,564	49,939	11,881
Corporate/Eliminations [Member]
Segment Reporting Information [Line Items]
Operating income (loss)										(25,262)	(30,299)	(21,744)
Identifiable assets	(716,386)				(769,168)				(714,004)	(716,386)	(769,168)	(714,004)
Capital expenditures										1,074	1,787	1,378
Depreciation and amortization										529	750	1,313
Corporate Identifiable Assets After Elimination Of Intercompany Assets [Member]
Segment Reporting Information [Line Items]
Identifiable assets	$ 18,900				$ 23,800				$ 15,600	18,900	23,800	15,600
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Special charges										22,872	18,909	9,889
Restructuring related inventory charges										(820)	346	0
Acquisition amortization										45,715	47,310	12,542
Special Acquisition Depreciation										4,352	7,049	233
Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital expenditures										$ 12,973	$ 21,153	$ 13,337