Special Charges (Special and Restructuring Charges, Net) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down					$ 879
Other Nonrecurring (Income) Expense			$ 17,686	$ 13,061	7,330
Special charges, net			17,686	13,061	7,330
Total restructuring charges, net		$ 16,910	5,186	5,848	2,559
Accounts Receivable, after Allowance for Credit Loss, Current			125,422
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			7,345
Restructuring and Related Cost, Incurred Cost			22,872	18,909	9,889
Energy Segment
Restructuring Cost and Reserve [Line Items]
Other Nonrecurring (Income) Expense			(3,348)	1,907	(11,596)
Total restructuring charges, net			(1,181)	3,661	54
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			(12,200)
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Other Nonrecurring (Income) Expense			11,018	9,266	12,766
Total restructuring charges, net					13,096
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			7,345
Divestiture [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net			5,951
Divestiture [Member] | Energy Segment
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net			(5,868)
Divestiture [Member] | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net			1,881
Divestiture [Member] | Rosscor B.V. and SES International B.V. [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net				1,888
Divestiture [Member] | Reliability Services Divestiture [Member] | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net	$ 2,200
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down				921
Facility Closing [Member] | Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down				0
Distributed Valves and Engineered Valves Business [Member]
Restructuring Cost and Reserve [Line Items]
Other Nonrecurring (Income) Expense			4,390	986	(659)
Distributed Valves and Engineered Valves Business [Member] | Energy Segment
Restructuring Cost and Reserve [Line Items]
Other Nonrecurring (Income) Expense			$ 2,520	$ 1,974	$ (329)