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Related Party Transactions
 6 Months Ended
Jun. 30, 2019
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,
 
2019
 
2018
 
2019
 
2018
Sales to unconsolidated affiliates
$
5,372

 
$
11,033

 
$
9,663

 
$
15,638

Purchases from unconsolidated affiliates(a)
$
55,617

 
$
57,059

 
$
119,116

 
$
125,975


(a)
Purchases from unconsolidated affiliates primarily relate to purchases from our Windfield joint venture.

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, 2019
 
December 31, 2018
Receivables from unconsolidated affiliates
$
3,698

 
$
14,348

Payables to unconsolidated affiliates
$
57,031

 
$
68,357