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Related Party Transactions
 6 Months Ended
Jun. 30, 2017
Related Party Transactions [Abstract]  
Related Party Transactions
Related Party Transactions:
Our condensed consolidated financial statements include sales to and purchases from unconsolidated affiliates in the ordinary course of business as follows (in thousands):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Sales to unconsolidated affiliates
$
9,255

 
$
8,231

 
$
16,444

 
$
14,405

Purchases from unconsolidated affiliates
55,949

 
27,160

 
96,519

 
62,781