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Product Warranty Reserves (Tables)
 6 Months Ended
Jun. 30, 2019
Product Warranty Reserves [Abstract]  
Product Warranty Liability 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