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Warranty Obligations (Tables)
 9 Months Ended
Sep. 30, 2018
Product Warranties Disclosures [Abstract]  
Changes in Warranty Obligations
The changes in the warranty obligation were as follows (in thousands):
Balance as of December 31, 2017
$
4,701

Provisions for warranties issued during the period
3,376

Fulfillment of warranty obligations
(3,223
)
Foreign exchange rate changes
(117
)
Balance as of September 30, 2018
$
4,737