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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
The following table summarizes the components of inventory:
 
June 30,
2017
 
December 31,
2016
Raw materials and supplies
$
72,692

 
$
65,719

Work in process
33,369

 
31,576

Finished goods
78,230

 
72,388

Total inventories, net
$
184,291

 
$
169,683