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Revenue Recognition - Disaggregated Revenue (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]          
Total revenues $ 529,405,000 $ 573,751,000 $ 1,105,137,000 $ 1,047,563,000  
Contract asset 0   0   $ 0
Contract liability 0   0   $ 0
Exploration and Production Revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 466,365,000 525,557,000 983,618,000 959,861,000  
Midstream Services          
Disaggregation of Revenue [Line Items]          
Total revenues 119,445,000 69,408,000 226,027,000 133,970,000  
Well Services          
Disaggregation of Revenue [Line Items]          
Total revenues 39,281,000 59,914,000 71,912,000 104,803,000  
Operating Segments | Exploration and Production Revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 466,365,000 525,557,000 983,618,000 959,861,000  
Operating Segments | Exploration and Production Revenues | Crude oil revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 327,977,000 363,182,000 646,098,000 689,492,000  
Operating Segments | Exploration and Production Revenues | Purchased crude oil sales          
Disaggregation of Revenue [Line Items]          
Total revenues 106,441,000 127,212,000 253,577,000 194,872,000  
Operating Segments | Exploration and Production Revenues | Natural gas revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 9,734,000 23,059,000 41,330,000 50,021,000  
Operating Segments | Exploration and Production Revenues | Purchased natural gas sales          
Disaggregation of Revenue [Line Items]          
Total revenues 2,920,000 496,000 4,255,000 545,000  
Operating Segments | Exploration and Production Revenues | NGL revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 19,293,000 11,608,000 38,358,000 24,931,000  
Operating Segments | Midstream Services          
Disaggregation of Revenue [Line Items]          
Total revenues 51,601,000 29,698,000 99,622,000 57,620,000  
Operating Segments | Midstream Services | Purchased crude oil sales          
Disaggregation of Revenue [Line Items]          
Total revenues 28,000 356,000 28,000 356,000  
Operating Segments | Midstream Services | Crude oil and natural gas revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 22,875,000 17,907,000 47,538,000 35,936,000  
Operating Segments | Midstream Services | Produced and flowback water revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 9,473,000 9,058,000 18,506,000 17,934,000  
Operating Segments | Midstream Services | Total midstream service revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 32,348,000 26,965,000 66,044,000 53,870,000  
Operating Segments | Midstream Services | Natural gas and NGL revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 17,319,000 0 30,116,000 0  
Operating Segments | Midstream Services | Freshwater revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 1,906,000 2,377,000 3,434,000 3,394,000  
Operating Segments | Midstream Services | Total midstream product revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 19,253,000 2,733,000 33,578,000 3,750,000  
Operating Segments | Well Services          
Disaggregation of Revenue [Line Items]          
Total revenues 11,439,000 18,496,000 21,897,000 30,082,000  
Operating Segments | Well Services | Hydraulic fracturing revenues          
Disaggregation of Revenue [Line Items]          
Total revenues 10,628,000 17,390,000 20,403,000 27,816,000  
Operating Segments | Well Services | Equipment rental revenues          
Disaggregation of Revenue [Line Items]          
Total revenues $ 811,000 $ 1,106,000 $ 1,494,000 $ 2,266,000