Special Charges (Narrative) (Details) $ in Thousands				3 Months Ended										6 Months Ended	9 Months Ended	12 Months Ended
	Jan. 06, 2015 entity	Mar. 28, 2014 USD ($)	Jan. 24, 2014 USD ($)	Dec. 31, 2016 USD ($)	Jul. 03, 2016 USD ($)	Apr. 03, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 04, 2015 USD ($)	Jul. 05, 2015 USD ($)	Apr. 05, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 28, 2014 USD ($)	Jun. 29, 2014 USD ($)	Jul. 03, 2016 USD ($)	Oct. 04, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down																$ 2,922
Non cash settlement				$ 4,500												4,457
Total restructuring charges, net																8,975	$ 4,634	$ 5,246
Long term purchase commitments								$ 1,600
Estimated litigation liability								500							$ 500
Litigation settlement		$ 1,500
Loss Contingency, Loss in Period		$ 300
Gain from settlement on TMW arbitration			$ 2,200
Inventories				149,584			$ 177,840									149,584	177,840
2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Non cash settlement																		210
Divestiture [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Number of non-core businesses divested | entity	2
Total restructuring charges, net											$ 3,400							3,413
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down																	9,425
Inventory Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net																2,800	9,400	8,000
Inventory Related Charges [Member] | Brazil Closure [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net					$ 100	$ 1,900	500	6,400
Critical Flow Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Acquisition related costs																1,000
Schroedahl [Member]
Restructuring Cost and Reserve [Line Items]
Acquisition related costs														$ 1,000		200	900
Energy Segment [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down																2,920
Non cash settlement											200					0
Total restructuring charges, net																3,185	2,903	1,963
Energy Segment [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Non cash settlement																		210
Energy Segment [Member] | Divestiture [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net																		2,983
Energy Segment [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down																2,900	8,650
Energy Segment [Member] | Inventory Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net								200
Advanced Flow Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down																0
Non cash settlement																0
Total restructuring charges, net																5,790	1,731	2,966
Advanced Flow Solutions [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Non cash settlement																		0
Advanced Flow Solutions [Member] | Divestiture [Member]
Restructuring Cost and Reserve [Line Items]
Other nonrecurring income										$ (1,000)
Advanced Flow Solutions [Member] | Divestiture [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net																		430
Advanced Flow Solutions [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down																	0
Advanced Flow Solutions [Member] | Inventory Related Charges [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net				800		$ 100		$ 400	$ 1,900			$ 2,900	$ 5,100
Inventories				200												200
Corporate Segment [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down																2
Non cash settlement																4,457
Total restructuring charges, net																0	0	317
Cash payment to CFO															$ 400
Corporate Segment [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Non cash settlement																		0
Corporate Segment [Member] | Divestiture [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net																		0
Corporate Segment [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down																	775
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment [Member] | Brazil Manufacturing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Assets				2,000			7,100									2,000	7,100
Cash				900			1,000									900	1,000
Assets held for sale				900												900
Third party accounts receivable				$ 200			1,000									$ 200	1,000
Inventory							4,200										4,200
Customer Related Settlement [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Non cash settlement											$ 6,200
Gain from settlement on TMW arbitration																		(6,232)
Customer Related Settlement [Member] | Energy Segment [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Gain from settlement on TMW arbitration																		(6,232)
Customer Related Settlement [Member] | Advanced Flow Solutions [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Gain from settlement on TMW arbitration																		0
Customer Related Settlement [Member] | Corporate Segment [Member] | 2014 Announced Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Gain from settlement on TMW arbitration																		$ 0
BRAZIL | Energy Segment [Member] | Facility Closing [Member] | Brazil Closure [Member]
Restructuring Cost and Reserve [Line Items]
Total restructuring charges, net																	8,700
Business exit costs																	4,400
Customer cancellation penalties																	1,100
Professional Fees							$ 800										300
Other charges																	$ 800