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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2018
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):
| 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.

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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