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Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
The following table summarizes the components of inventory:
 
March 31,
2017
 
December 31,
2016
Raw materials and supplies
$
74,419

 
$
65,719

Work in process
36,698

 
31,576

Finished goods
74,158

 
72,388

Total inventories, net
$
185,275

 
$
169,683