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Product Warranty Reserves (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018 and 2017 are as follows:

  
Three Months Ended
 June 30,
  
Six Months Ended
 June 30,
 
  
2018
  
2017
  
2018
  
2017
 
Reserve balance, beginning of the period
 
$
16,013
  
$
13,719
  
$
15,410
  
$
13,156
 
Warranty liabilities accrued
  
4,076
   
4,252
   
7,529
   
8,248
 
Warranty liabilities settled
  
(3,851
)
  
(3,724
)
  
(6,676
)
  
(7,184
)
Pellet plant agreement warranty write-off
  
(4,806
)
  
--
   
(4,806
)
  
--
 
Other
  
112
   
22
   
87
   
49
 
Reserve balance, end of the period
 
$
11,544
  
$
14,269
  
$
11,544
  
$
14,269