Inventory (Tables)

6 Months Ended

Jun. 30, 2018

Inventory [Abstract]

Components Of Inventory

	June 30, 2018		December 31, 2017
Finished goods	$	72,884	$	61,764
Raw materials		14,955		13,727
Work-in-process		10,051		6,174
Supplies and consumables		26,309		24,923
Total	$	124,199	$	106,588