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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2021
Related Party Transactions [Abstract]  
Schedule of 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
September 30,		Nine Months Ended
September 30,
2021202020212020
Sales to unconsolidated affiliates$5,629 $4,863 $16,357 $17,361 
Purchases from unconsolidated affiliates(a)
$55,540 $10,742 $144,461 $142,366 
(a)Purchases from unconsolidated affiliates primarily relate to purchases from our Windfield joint venture.

Our consolidated balance sheets include accounts receivable due from and payable to unconsolidated affiliates in the ordinary course of business as follows (in thousands):
September 30, 2021December 31, 2020
Receivables from unconsolidated affiliates$1,782 $4,098 
Payables to unconsolidated affiliates$36,744 $30,123