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Related Party Transactions | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
Sales to unconsolidated affiliates | $ | 29,514 |  |  | $ | 29,651 |  |  | $ | 24,180 |
Purchases from unconsolidated affiliates(a) | $ | 209,266 |  |  | $ | 130,287 |  |  | $ | 115,697 |
(a) | Increase in 2017 primarily due to material 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,
| 2017 |  | 2016
Receivable from related parties | $ | 2,406 |  |  | $ | 2,159 |
Payable to related parties | $ | 55,801 |  |  | $ | 38,466 |

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- Definition The entire disclosure for related party transactions. Examples of related party transactions include 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -URI http://asc.fasb.org/topic&trid=2122745 + Details
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