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Restructuring and Impairment Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Other income (expense)	$ 588	$ 184	$ 969	$ (115)
Restructuring and impairment charges	$ 0	369	$ 0	1,726
Accounting Standards Update 2017-07 [Member]
Restructuring Cost and Reserve [Line Items]
Other income (expense)		0		420
Employee Severance And Other Employment Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		369		2,146
Restructuring and impairment charges				$ 1,813
Property, Plant And Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charge		$ 333

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of income (expense) related to nonoperating activities, classified as other.

+ References

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

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