Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories are valued at the lower of cost or market. Inventories at June 30, 2018 and December 31, 2017 consisted of the following:

	June 30, 2018			December 31, 2017
Inventories carried at LIFO:
Finished goods	$	49,428		$	43,439
Raw materials, production parts and work-in-process	29,266			23,694
LIFO reserve	(28,609		)	(28,429		)
Total LIFO inventories	50,085			38,704
Inventories carried at FIFO:
Finished goods	51,226			54,161
Raw materials, production parts and work-in-process	38,095			34,829
Total FIFO inventories	89,321			88,990
Total inventories	$	139,406		$	127,694