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Revenue From Contracts with Customers - Narratives (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue      
Accounts and notes receivable, net of allowances $ 220,631   $ 116,841
Revenue recognized $ 20,604 $ 0