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Restructuring Charges - Prior Period Restructuring Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 12,490	$ 7,753	$ 8,159
Resource Rationalizations 2017
Restructuring Reserve [Roll Forward]
Closing provision	3,097
Restructuring charges			7,753
Utilized	(1,015)	(4,656)
Closing provision	2,082	3,097
Resource Rationalizations 2017 | Workforce Reductions
Restructuring Reserve [Roll Forward]
Utilized	(5,399)
Resource Rationalizations 2016
Restructuring Reserve [Roll Forward]
Closing provision	317	1,791
Restructuring charges			8,159
Utilized	(317)	(1,474)	(6,305)
Foreign exchange			(63)
Closing provision	0	317	1,791
Resource Rationalizations 2016 | Workforce Reductions
Restructuring Reserve [Roll Forward]
Closing provision	0	393
Restructuring charges			6,190
Utilized	0	(393)	(5,734)
Foreign exchange			(63)
Closing provision	0	0	393
Resource Rationalizations 2016 | Onerous Lease
Restructuring Reserve [Roll Forward]
Closing provision	317	1,398
Restructuring charges			1,969
Utilized	(317)	(1,081)	(571)
Foreign exchange			0
Closing provision	$ 0	$ 317	$ 1,398

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Restructuring Reserve Utilizations

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
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