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Related Party Transactions
 3 Months Ended
Mar. 31, 2021
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
March 31,
20212020
Sales to unconsolidated affiliates$5,730 $7,217 
Purchases from unconsolidated affiliates(a)
$33,150 $76,475 
(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):
March 31, 2021December 31, 2019
Receivables from unconsolidated affiliates$5,862 $4,098 
Payables to unconsolidated affiliates$33,988 $30,123