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Revenue From Contracts With Customers Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jan. 03, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Payment terms for contract with customers 25 days    
Receivables related to contracts with customers $ 147,724   $ 156,817
Midstream Acquisition [Member]      
Business Acquisition [Line Items]      
Receivables related to acquisition   $ 9,353