Related Party Transactions

12 Months Ended

Dec. 31, 2018

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,
	2018		2017		2016
Sales to unconsolidated affiliates	$	35,094	$	29,514	$	29,651
Purchases from unconsolidated affiliates^(a)	$	256,701	$	209,266	$	130,287


(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,
	2018		2017
Receivables from related parties^(a)	$	14,348	$	2,406
Payables to related parties	$	68,357	$	55,801


(a)	Increase in receivables from related parties balance due to timing of payments in the normal course of business from one of our Catalysts joint ventures.