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Related Party Transactions
 6 Months Ended
Jun. 30, 2018
Related Party Transactions [Abstract]  
Related Party Transactions
Related Party Transactions:
Our consolidated statements of income 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,
 
2018
 
2017
 
2018
 
2017
Sales to unconsolidated affiliates
$
11,033

 
$
9,255

 
$
15,638

 
$
16,444

Purchases from unconsolidated affiliates
$
57,059

 
$
55,949

 
$
125,975

 
$
96,519


Our condensed consolidated balance sheets include accounts receivable due from and payable to unconsolidated affiliates in the ordinary course of business as follows (in thousands):
 
June 30, 2018
 
December 31, 2017
Receivable from related parties
$
3,239

 
$
2,406

Payable to related parties
$
56,753

 
$
55,801