|**Properties and Equipment (Tables)**                                                        | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|-------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Oil and Gas Property [Abstract]**                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Property, Plant and Equipment [Table Text Block]                                             | The following table presents the components of properties and equipment, net of accumulated depreciation, depletion and amortization (“DD&A”), as of the dates indicated:December 31,20212020(in thousands)Properties and equipment, net:Crude oil and natural gas propertiesProved$8,310,018$7,523,639Unproved306,181350,677Total crude oil and natural gas properties8,616,1997,874,316Equipment and other63,09965,027Land and buildings19,92824,299Construction in progress371,968523,550Properties and equipment, at cost9,071,1948,487,192Accumulated DD&A(4,256,329)(3,627,993)Properties and equipment, net$4,814,865$4,859,199
|                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                                             | December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|                                                                                             | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                             | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Properties and equipment, net:                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Crude oil and natural gas properties                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Proved                                                                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Unproved                                                                                     | 306,181                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Total crude oil and natural gas properties                                                   | 8,616,199                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Equipment and other                                                                          | 63,099                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Land and buildings                                                                           | 19,928                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Construction in progress                                                                     | 371,968                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|Properties and equipment, at cost                                                            | 9,071,194                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
|Accumulated DD&A                                                                             | (4,256,329)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Properties and equipment, net                                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Impairment of natural gas and crude oil properties [Table Text Block]                        | The following table presents impairment charges recorded for properties and equipment for the periods presented:Year Ended December 31,202120202019(in thousands)Impairment of proved and unproved properties$402$881,238$10,599Impairment of infrastructure and other—1,15527,937Total impairment of properties and equipment$402$882,393$38,536                                                                                                                                                                                                                                                                                     
|                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                                             | Year Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                             | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                             | (in thousands)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Impairment of proved and unproved properties                                                 | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Impairment of infrastructure and other                                                       | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Total impairment of properties and equipment                                                 | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Capitalized Exploratory Well Costs, Roll Forward                                             | The following table presents the capitalized exploratory well cost pending determination of proved reserves and included in properties and equipment for the periods presented:Year Ended December 31,202120202019(in thousands, except for number of wells)Beginning balance$7,459$16,078$12,188Additions to capitalized exploratory well costs pending the determination of proved reserves5,90211,77031,901Reclassifications to proved properties(13,361)(20,389)(28,011)Ending balance$—$7,459$16,078Number of wells pending determination at period-end—24                                                                       
|                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|                                                                                             | Year Ended December 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|                                                                                             | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                                             | (in thousands, except for number of wells)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
|Beginning balance                                                                            | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Additions to capitalized exploratory well costs pending the determination of proved reserves | 5,902                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
|Reclassifications to proved properties                                                       | (13,361)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Ending balance                                                                               | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|                                                                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Number of wells pending determination at period-end                                          | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     

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