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Product Warranties (Tables)
9 Months Ended
Sep. 30, 2019
Guarantees and Product Warranties [Abstract]  
Product Warranty Activities
Product warranty activities were as follows:
 
Nine Months Ended
 
September 30,
 
 
2019
   
2018
 
Beginning of period
  $
 
10,399
   
 
 
 
 
 
 
 
$
 
 
10,104
 
Assumed product warranty liability from ESI Merger
   
7,177
     
—  
 
Provision for product warranties
   
18,700
     
11,448
 
Direct and other charges to warranty liability
   
(21,209
)    
(11,072
)
                 
End of period
(1)
  $
15,067
    $
10,480
 
                 
 
(1)
As of September 30, 2019, short-term product warranty of $12,028 and long-term product warranty of $3,039 were included within other ​​​​​​​current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet. As of September 30, 2018, short-term product warranty of $10,067 and long-term product warranty of $413 were included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet
.