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Product Warranty Reserves (Tables)
 9 Months Ended
Sep. 30, 2018
Product Warranty Reserves [Abstract]  
Product Warranty Liability
Changes in the Company's product warranty liability for the three and nine-month periods ended September 30, 2018 and 2017 are as follows:

  
Three Months Ended
 September 30,
  
Nine Months Ended
 September 30,
 
  
2018
  
2017
  
2018
  
2017
 
Reserve balance, beginning of the period
 
$
11,544
  
$
14,269
  
$
15,410
  
$
13,156
 
Warranty liabilities accrued
  
2,586
   
3,594
   
10,115
   
11,842
 
Warranty liabilities settled
  
(2,998
)
  
(3,888
)
  
(9,674
)
  
(11,072
)
Pellet plant agreement warranty write-off
  
--
   
--
   
(4,806
)
  
--
 
Other
  
(220
)
  
14
   
(133
)
  
63
 
Reserve balance, end of the period
 
$
10,912
  
$
13,989
  
$
10,912
  
$
13,989