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Restructuring and Impairment Charges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Other income (expense)	$ 452	$ 335	$ 1,421	$ 219
Restructuring and impairment charges	$ 0	59	$ 0	1,785
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		59		2,205
Restructuring and impairment charges				$ 1,872
Property, Plant And Equipment [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charge		$ 333

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- 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.

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Amount of income (expense) related to nonoperating activities, classified as other.

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