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Revenue Recognition - Disaggregated Revenue (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Total revenues $ 575,732,000 $ 473,812,000  
Contract asset 0   $ 0
Contract liability 0   $ 0
Exploration and Production      
Disaggregation of Revenue [Line Items]      
Total revenues 517,253,000 434,304,000  
Midstream Services      
Disaggregation of Revenue [Line Items]      
Total revenues 106,582,000 64,562,000  
Well Services      
Disaggregation of Revenue [Line Items]      
Total revenues 32,631,000 44,888,000  
Operating Segments | Exploration and Production      
Disaggregation of Revenue [Line Items]      
Total revenues 517,253,000 434,304,000  
Operating Segments | Exploration and Production | Crude oil revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 318,120,000 326,310,000  
Operating Segments | Exploration and Production | Purchased crude oil sales      
Disaggregation of Revenue [Line Items]      
Total revenues 147,136,000 67,660,000  
Operating Segments | Exploration and Production | Natural gas revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 27,452,000 26,962,000  
Operating Segments | Exploration and Production | Purchased natural gas sales      
Disaggregation of Revenue [Line Items]      
Total revenues 1,335,000 49,000  
Operating Segments | Exploration and Production | NGL revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 23,210,000 13,323,000  
Operating Segments | Midstream Services      
Disaggregation of Revenue [Line Items]      
Total revenues 48,021,000 27,922,000  
Operating Segments | Midstream Services | Crude oil and natural gas revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 24,664,000 18,029,000  
Operating Segments | Midstream Services | Produced and flowback water revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 9,033,000 8,876,000  
Operating Segments | Midstream Services | Total midstream service revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 33,697,000 26,905,000  
Operating Segments | Midstream Services | Natural gas and NGL revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 12,797,000 0  
Operating Segments | Midstream Services | Freshwater revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 1,527,000 1,017,000  
Operating Segments | Midstream Services | Total midstream product revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 14,324,000 1,017,000  
Operating Segments | Well Services      
Disaggregation of Revenue [Line Items]      
Total revenues 10,458,000 11,586,000  
Operating Segments | Well Services | Hydraulic fracturing revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 9,775,000 10,426,000  
Operating Segments | Well Services | Equipment rental revenues      
Disaggregation of Revenue [Line Items]      
Total revenues $ 683,000 $ 1,160,000