Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventory Components

Inventories at December 31, 2017 and 2016 consisted of the following:

	December 31,
	2017			2016
Raw materials	$	30,166		$	28,541
Work in process	4,981			6,498
Supplies and service parts	45,366			45,152
Finished products	21,765			24,678
Inventory at FIFO cost, net	102,278			104,869
Excess of FIFO cost over LIFO cost	(12,599		)	(12,143		)
Total inventory, net	$	89,679		$	92,726