Inventory (Tables)

3 Months Ended

Mar. 31, 2016

Inventory [Abstract]

Schedule of Inventory, Current [Table Text Block]

	March 31, 2016		December 31, 2015
Finished goods	$	71,377	$	71,951
Raw materials		17,387		23,418
Work-in-process		6,276		18,203
Supplies and consumables		36,271		35,189
Total	$	131,311	$	148,761