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Revenue from Contracts with Customers Revenue from Contracts with Customers (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Adoption of ASC606 [Line Items]        
Contract liability $ 11,331     $ 0
Contract with Customer, Liability, Revenue Recognized (2,371) $ 0    
Mid-Stream [Member]        
Adoption of ASC606 [Line Items]        
Contract assets 12,015   $ 10,798  
Change in contract assets 1,217      
Contract liability 11,331   12,485  
Contract with Customer, Liability, Revenue Recognized 1,154      
Contract liabilities, net 684   $ (1,687)  
Change in contract liabilities, net $ 2,371