Inventory (Tables)

6 Months Ended

Jun. 30, 2017

Inventory [Abstract]

Schedule of Inventory, Current [Table Text Block]

	June 30, 2017		December 31, 2016
Finished goods	$	62,100	$	49,888
Raw materials		13,270		17,948
Work-in-process		5,704		5,214
Supplies and consumables		29,387		30,029
Total	$	110,461	$	103,079