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Revenue Recognition - Disaggregated Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Total revenues $ 387,798 $ 575,732
Exploration and Production Revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 331,387 527,711
Midstream services    
Disaggregation of Revenue [Line Items]    
Total revenues 124,955 106,582
Operating Segments | Exploration and Production Revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 331,387 527,711
Operating Segments | Exploration and Production Revenues | Crude oil revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 212,793 318,120
Operating Segments | Exploration and Production Revenues | Purchased crude oil sales    
Disaggregation of Revenue [Line Items]    
Total revenues 85,757 147,136
Operating Segments | Exploration and Production Revenues | Natural gas and NGL revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 26,335 50,662
Operating Segments | Exploration and Production Revenues | Purchased natural gas sales    
Disaggregation of Revenue [Line Items]    
Total revenues 521 1,335
Operating Segments | Exploration and Production Revenues | NGLs    
Disaggregation of Revenue [Line Items]    
Total revenues 5,981 10,458
Operating Segments | Midstream services    
Disaggregation of Revenue [Line Items]    
Total revenues 56,411 48,021
Operating Segments | Midstream services | Crude oil and natural gas revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 26,921 24,664
Operating Segments | Midstream services | Produced and flowback water revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 11,251 9,033
Operating Segments | Midstream services | Total midstream service revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 38,172 33,697
Operating Segments | Midstream services | Natural gas and NGL revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 16,039 12,797
Operating Segments | Midstream services | Freshwater revenues    
Disaggregation of Revenue [Line Items]    
Total revenues 2,200 1,527
Operating Segments | Midstream services | Total midstream product revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ 18,239 $ 14,324