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Restructuring Charges - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges (Note 5)	$ (2,335)	$ (967)		$ (7,609)	$ (13,706)
Currency translation and other adjustments				(500)		$ (300)
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges (Note 5)				(3,500)
Currency translation and other adjustments				0		0
Americas
Restructuring Cost and Reserve [Line Items]
Restructuring charges (Note 5)				(600)	(12,400)
Currency translation and other adjustments				(200)		(200)
International
Restructuring Cost and Reserve [Line Items]
Restructuring charges (Note 5)				(3,500)	$ (1,600)
Currency translation and other adjustments				$ (300)		$ (100)
Voluntary Retirement Incentive Package | Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Severance costs			$ 11,400

X

- 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
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- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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