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Inventories (Tables)
3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
The following table summarizes the components of inventory:
 
March 31,
2015
 
December 31,
2014
Raw materials and supplies
$
94,521

 
$
94,437

Work in process
43,628

 
35,631

Finished goods
93,086

 
85,657

Total inventories, net
$
231,235

 
$
215,725