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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories as of December 31, consisted of the following:
 
2017
 
2016
Inventories carried at LIFO:
 
 
 
Finished goods
$
43,439

 
$
39,142

Raw materials, production parts and work-in-process
23,694

 
23,980

LIFO reserve
(28,429
)
 
(28,190
)
Total LIFO inventories
$
38,704

 
$
34,932

 
 
 
 
Inventories carried at FIFO:
 
 
 
Finished goods
$
54,161

 
$
31,044

Raw materials, production parts and work-in-process
34,829

 
12,646

Total FIFO inventories
$
88,990

 
$
43,690

Total inventories
$
127,694

 
$
78,622