Inventories (Tables)
 3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories are valued at the lower of cost or market. Inventories at March 31, 2015 and December 31, 2014 consisted of the following:
 
March 31,
2015
 
December 31,
2014
Inventories carried at LIFO:
 
 
 
Finished goods
$
45,589

 
$
41,687

Raw materials, production parts and work-in-process
26,113

 
24,458

LIFO reserve
(28,166
)
 
(28,166
)
Total LIFO inventories
43,536

 
37,979

Inventories carried at FIFO:
 

 
 

Finished goods
29,685

 
29,851

Raw materials, production parts and work-in-process
12,390

 
12,681

Total FIFO inventories
42,075

 
42,532

Total inventories
$
85,611

 
$
80,511