Restructuring - 2014 Restructuring (Details) $ in Thousands	3 Months Ended								12 Months Ended			21 Months Ended	27 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) headcount
Restructuring Cost and Reserve [Line Items]
Restructuring charges									$ 9,168	$ 968	$ 687
Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Estimated annual savings												$ 10,800
Total headcount reduction | headcount													86
Restructuring charges, incurred									(172)	10,980	49,518		$ 60,300
Non-Cash Restructuring Charges									(465)	4,680	43,875
Cash Restructuring Charges									293	6,300	5,643
Restructuring costs, after tax													44,800
Utilized non-cash									4,046	11,083			48,300
Cash									592	6,253			12,000
Restructuring charges	$ 300	$ (400)	$ 100	$ (200)	$ 300	$ 1,500	$ 5,700	$ 3,500		8,100	47,800
Restructuring Plan 2014 | Cost of revenues
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									55	2,717	15,686
Non-Cash Restructuring Charges									0	1,620	14,610
Cash Restructuring Charges									55	1,097	1,076
Restructuring Plan 2014 | Operating expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									(300)	4,387	20,555
Non-Cash Restructuring Charges									(465)	25	17,579
Cash Restructuring Charges									165	4,362	2,976
Restructuring Plan 2014 | Definite-lived intangible asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											10,896
Non-Cash Restructuring Charges											10,896
Cash Restructuring Charges											0
Restructuring Plan 2014 | Restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									73	968	687
Non-Cash Restructuring Charges									0	0	0
Cash Restructuring Charges									73	968	687
Restructuring Plan 2014 | Other expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred										2,908	1,694
Non-Cash Restructuring Charges										3,035	790
Cash Restructuring Charges										(127)	904
Severance and benefit related costs | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									73	801	687
Utilized non-cash									0	0
Cash									73	1,260
Lease termination costs | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									0	167	0
Utilized non-cash										0
Cash										165
Allowances for doubtful accounts | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									(585)	1,186	11,947
Utilized non-cash									3,739	5,644
Cash									0	0
Inventory obsolescence | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									0	0	2,746
Fixed asset impairment | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									0	0	11,871
Other asset write-offs | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									0	1,880	15,909
Utilized non-cash										1,880
Cash										0
Other restructuring | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred									340	6,946	6,358
Utilized non-cash									307	3,559
Cash									519	4,828
Employee severance and lease termination | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges									100	1,000	700
Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Utilized non-cash											21,700
Infrastructure Solutions | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Estimated annual savings												8,400
Restructuring charges, incurred											27,284
Restructuring charges									(200)	$ 8,100	25,600
Infrastructure Solutions | Severance and benefit related costs | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											687
Infrastructure Solutions | Lease termination costs | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											0
Infrastructure Solutions | Allowances for doubtful accounts | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											11,947
Infrastructure Solutions | Inventory obsolescence | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											2,746
Infrastructure Solutions | Fixed asset impairment | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											533
Infrastructure Solutions | Other asset write-offs | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											5,013
Infrastructure Solutions | Other restructuring | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											6,358
Infrastructure Solutions | Non-Cash Restructuring | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	26,100								26,100				26,100
Corrosion Protection | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Estimated annual savings												$ 2,400
Restructuring charges, incurred											22,234
Restructuring charges											11,300
Corrosion Protection | Severance and benefit related costs | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											0
Corrosion Protection | Lease termination costs | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											0
Corrosion Protection | Allowances for doubtful accounts | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											0
Corrosion Protection | Inventory obsolescence | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											0
Corrosion Protection | Fixed asset impairment
Restructuring Cost and Reserve [Line Items]
Utilized non-cash											11,300
Corrosion Protection | Fixed asset impairment | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											11,338
Corrosion Protection | Other asset write-offs | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											10,896
Corrosion Protection | Other restructuring | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges, incurred											0
Corrosion Protection | Non-Cash Restructuring | Restructuring Plan 2014
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	$ 22,200								$ 22,200				$ 22,200
Corrosion Protection | Definite-lived intangible asset impairment
Restructuring Cost and Reserve [Line Items]
Utilized non-cash											$ 10,900