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Revenue From Contracts with Customers - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue    
Accounts and notes receivable, net of allowances $ 252,216 $ 116,841
Revenue recognized 16,556  
Long-term contracts    
Disaggregation of Revenue    
Revenue recognized $ 272,200