Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Gathering and Treating Fees) (Details)

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Revenue Recognition (Gathering and Treating Fees) (Details) - Natural Gas, Gathering and Treating Fees - Accounting Standards Update 2014-09 - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Natural Gas Revenue        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cost of goods and services sold $ 2,209   $ 5,413  
Lease Operating Expense        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cost of goods and services sold   $ 909   $ 2,393