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Receivables Receivables (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 29, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Related party receivables, net $ 2,310,000 $ 3,341,000  
Northwest Gas Processing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Promissory note     $ 1,500,000
Debt Instrument, Interest Rate, Stated Percentage     8.00%
Notes receivable from related party, net $ 1,700,000 1,700,000  
High Mesa Agreement | Affiliated Entity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Initial agreement term 180 days    
Automatic renewal period 180 days    
Notice period to terminate agreement 90 days    
Management fee   10,000  
Balance of note receivable $ 9,900,000 10,100,000  
Allowance for uncollectible accounts 9,900,000 9,000,000  
Unamortized premium on 2024 Notes | High Mesa Services LLC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance of note receivable $ 11,700,000 $ 11,700,000  
Debt Instrument, Interest Rate, Stated Percentage 8.00%    
Related party receivables, net $ 8,500,000