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Revenue From Contracts with Customers - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Disaggregation of Revenue      
Revenue $ 454,890 $ 1,363,121  
Accounts and notes receivable, net of allowances 204,704 204,704 $ 116,841
Long-term contracts      
Disaggregation of Revenue      
Revenue $ 359,405 976,852  
Revenue recognized   $ 0