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Revenue from Contracts with Customers Revenue from Contracts with Customers (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Adoption of ASC606 [Line Items]        
Contract liability $ 11,942     $ 0
Change in contract liabilities 1,192 $ 0    
Mid-Stream [Member]        
Adoption of ASC606 [Line Items]        
Contract assets 11,447   $ 10,798  
Change in contract assets 649      
Contract liability 11,942   12,485  
Change in contract liabilities (543)      
Contract liabilities, net (495)   $ (1,687)  
Mid-Stream [Member] | Adjustments due to ASC606 [Member]        
Adoption of ASC606 [Line Items]        
Change in contract liabilities, net $ 1,192