Inventory (Tables)

9 Months Ended

Sep. 30, 2017

Inventory [Abstract]

Components Of Inventory

	September 30, 2017		December 31, 2016
Finished goods	$	59,263	$	49,888
Raw materials		13,360		17,948
Work-in-process		5,289		5,214
Supplies and consumables		29,748		30,029
Total	$	107,660	$	103,079