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Revenue Recognition - Disaggregated Revenue (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]          
Total revenues $ 482,743,000 $ 674,629,000 $ 1,587,880,000 $ 1,722,192,000  
Contract asset 0   0   $ 0
Contract liability 0   0   $ 0
Exploration and Production Revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 423,822,000 625,342,000 1,407,440,000 1,585,204,000  
Midstream Services          
Disaggregation of Revenue [Line Items]          
Total revenues 123,411,000 75,770,000 349,438,000 209,739,000  
Well Services          
Disaggregation of Revenue [Line Items]          
Total revenues 30,409,000 56,439,000 102,321,000 161,242,000  
Operating Segments | Exploration and Production Revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 423,822,000 625,342,000 1,407,440,000 1,585,204,000  
Operating Segments | Exploration and Production Revenues | Crude oil revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 318,564,000 414,082,000 964,662,000 1,103,575,000  
Operating Segments | Exploration and Production Revenues | Purchased crude oil sales          
Disaggregation of Revenue [Line Items]          
Total revenues 77,018,000 169,531,000 330,594,000 364,404,000  
Operating Segments | Exploration and Production Revenues | Natural gas and NGL revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 25,906,000 40,113,000 105,594,000 115,064,000  
Operating Segments | Exploration and Production Revenues | Purchased natural gas sales          
Disaggregation of Revenue [Line Items]          
Total revenues 2,334,000 1,616,000 6,590,000 2,161,000  
Operating Segments | Midstream Services          
Disaggregation of Revenue [Line Items]          
Total revenues 50,023,000 33,025,000 149,645,000 90,644,000  
Operating Segments | Midstream Services | Purchased crude oil sales          
Disaggregation of Revenue [Line Items]          
Total revenues 0 1,838,000 28,000 2,193,000  
Operating Segments | Midstream Services | Crude oil and natural gas revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 21,653,000 18,188,000 69,189,000 54,124,000  
Operating Segments | Midstream Services | Produced and flowback water revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 10,803,000 9,985,000 29,309,000 27,919,000  
Operating Segments | Midstream Services | Total midstream service revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 32,456,000 28,173,000 98,498,000 82,043,000  
Operating Segments | Midstream Services | Natural gas and NGL revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 16,424,000 0 46,541,000 0  
Operating Segments | Midstream Services | Freshwater revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 1,143,000 3,014,000 4,578,000 6,408,000  
Operating Segments | Midstream Services | Total midstream product revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 17,567,000 4,852,000 51,147,000 8,601,000  
Operating Segments | Well Services          
Disaggregation of Revenue [Line Items]          
Total revenues 8,898,000 16,262,000 30,795,000 46,344,000  
Operating Segments | Well Services | Hydraulic fracturing revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 8,228,000 14,985,000 28,631,000 42,801,000  
Operating Segments | Well Services | Equipment rental revenues          
Disaggregation of Revenue [Line Items]          
Total revenues $ 670,000 $ 1,277,000 $ 2,164,000 $ 3,543,000