Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Basis of Presentation (Details)

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Description of Business and Basis of Presentation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating revenues:        
Total operating revenues $ 161,214 $ 84,614 $ 425,729 $ 248,261
Operating expenses:        
Lease operating expenses 18,525 11,624 44,705 36,708
Total operating expenses 88,403 53,188 224,532 160,843
Natural gas sales        
Operating revenues:        
Total operating revenues 18,613 $ 11,265 45,229 $ 30,019
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09        
Operating revenues:        
Total operating revenues 2,209   5,413  
Operating expenses:        
Lease operating expenses 2,209   5,413  
Total operating expenses 2,209   5,413  
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 | Natural gas sales        
Operating revenues:        
Total operating revenues 2,209   5,413  
Difference between Revenue Guidance in Effect before and after Topic 606        
Operating revenues:        
Total operating revenues 163,423   431,142  
Operating expenses:        
Lease operating expenses 20,734   50,118  
Total operating expenses 90,612   229,945  
Difference between Revenue Guidance in Effect before and after Topic 606 | Natural gas sales        
Operating revenues:        
Total operating revenues $ 20,822   $ 50,642