Related Party Transactions (Details) - Unconsolidated Affiliates - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Sales to unconsolidated affiliates	$ 35,094	$ 29,514	$ 29,651
Purchases from unconsolidated affiliates	256,701	209,266	$ 130,287
Receivables from related parties	14,348	2,406
Payables to related parties	$ 68,357	$ 55,801

Amount for accounts payable to related parties.

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For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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