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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2015
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions [Table Text Block]
Our consolidated financial statements include sales to and purchases from unconsolidated affiliates in the ordinary course of business as follows (in thousands):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Sales to unconsolidated affiliates
$
25,903

 
$
45,415

 
$
29,420

Purchases from unconsolidated affiliates
115,697

 
64,631

 
57,022