Related Party Transactions (Details) - Unconsolidated Affiliates - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Sales to unconsolidated affiliates	$ 4,291	$ 4,605
Purchases from unconsolidated affiliates(a)	63,499	$ 68,916
Receivables from unconsolidated affiliates	2,136		$ 14,348
Payables to unconsolidated affiliates	$ 58,220		$ 68,357

Amount for accounts payable to related parties.

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