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Related Party Transactions
 12 Months Ended
Dec. 31, 2020
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):
Year Ended December 31,
202020192018
Sales to unconsolidated affiliates$22,589 $20,068 $35,094 
Purchases from unconsolidated affiliates(a)
$168,072 $210,351 $256,701 
(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):
December 31,
20202019
Receivables from related parties$4,098 $7,163 
Payables to related parties$30,123 $35,502