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Product Warranty Reserves
 6 Months Ended
Jun. 30, 2019
Product Warranty Reserves [Abstract]  
Product Warranty Reserves
Note 8.  Product Warranty Reserves
The Company warrants its products against manufacturing defects and performance to specified standards. The warranty period and performance standards vary by market and uses of its products, but generally range from three months to two years or up to a specified number of hours of operation. The Company estimates the costs that may be incurred under its warranties and records a liability at the time product sales are recorded.  The product warranty liability is primarily based on historical claim rates, nature of claims and the associated cost.

Changes in the Company’s product warranty liability for the three and six-month periods ended June 30, 2019 and 2018 are as follows:


  
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2019
    
2018
    
2019
    
2018
  
Reserve balance, beginning of the period
  
$
11,051
    
$
16,013
    
$
10,928
    
$
15,410
  
Warranty liabilities accrued
    
1,750
      
4,076
      
4,496
      
7,529
  
Warranty liabilities settled
    
(2,644
)
    
(3,851
)
    
(5,287
)
    
(6,676
)
Pellet plant agreement write-off
    
–
      
(4,806
)
    
–
      
(4,806
)
Other
    
(40
)
    
112
      
(20
)
    
87
  
Reserve balance, end of the period
  
$
10,117
    
$
11,544
    
$
10,117
    
$
11,544