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Business Reorganization (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Schedule of Liability for 2017 employee termination actions
The following table sets forth the change in the liability for the 2017 employee termination actions:
 
January 1, 2017
$
—

Employee severance costs
3,796

Payments
(3,099
)
Foreign currency translation
(48
)
December 31, 2017
$
649