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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
The following table summarizes the components of inventory:
 
June 30,
2015
 
December 31,
2014
Raw materials and supplies
$
86,140

 
$
94,437

Work in process
42,293

 
35,631

Finished goods
103,122

 
85,657

Total inventories, net
$
231,555

 
$
215,725