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Warranty Obligations (Tables)
6 Months Ended
Jun. 30, 2019
Product Warranties Disclosures [Abstract]  
Changes in Warranty Obligations
The changes in the warranty obligation were as follows (in thousands):
Balance as of December 31, 2018
$
4,743

Provisions for warranties issued during the period
2,533

Fulfillment of warranty obligations
(1,824
)
Balance as of June 30, 2019
$
5,452