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Related Party Transactions
 9 Months Ended
Sep. 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 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
Sales to unconsolidated affiliates
$
7,309

 
$
5,047

 
$
23,753

 
$
19,452

Purchases from unconsolidated affiliates
$
51,983

 
$
30,591

 
$
148,502

 
$
93,372