Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures (Narrative) (Details)

v3.20.4
Acquisitions and Divestitures (Narrative) (Details)
$ / shares in Units, shares in Millions
3 Months Ended 4 Months Ended 12 Months Ended
Nov. 02, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 20, 2019
USD ($)
$ / shares
shares
Aug. 31, 2018
USD ($)
a
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
a
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 01, 2020
Jun. 07, 2018
Business Acquisition [Line Items]                                            
Proceeds from sales of working interest                                 $ 178,970,000   $ 294,417,000 $ 9,009,000    
Total operating revenues           $ 295,968,000 $ 290,026,000 $ 157,234,000 $ 289,919,000 $ 196,095,000 $ 155,378,000 $ 167,052,000 $ 153,047,000       1,033,147,000   671,572,000 587,624,000    
Total operating expenses                                 $ 3,489,999,000   498,914,000 $ 328,094,000    
6.375% Senior Notes due 2026                                            
Business Acquisition [Line Items]                                            
Debt instrument, interest rate, stated (as a percent)           6.375%                     6.375% 6.375%        
6.375% Senior Notes due 2026 | Unsecured debt                                            
Business Acquisition [Line Items]                                            
Debt instrument, interest rate, stated (as a percent)         6.375%                                 6.375%
Carrizo                                            
Business Acquisition [Line Items]                                            
Acquisition related costs                                     15,600,000      
Carrizo | 8.875% Preferred Stock                                            
Business Acquisition [Line Items]                                            
Preferred stock cumulative cash dividends rate       8.875%                                    
Certain Non-core Assets in the Midland Basin                                            
Business Acquisition [Line Items]                                            
Disposal group, consideration                       244,900,000                    
Disposal group, potential contingency payments                       $ 60,000,000.0                    
Disposal group, area of land | a                       9,850                    
Working interest                       66.00%                    
ORRI Transaction                                            
Business Acquisition [Line Items]                                            
Percent of overriding royalty interest to be sold                                         2.00%  
Disposal group, consideration   $ 140,000,000.0         $ 140,000,000.0                              
Proceeds from divestiture of businesses   $ 135,800,000                                        
Carrizo                                            
Business Acquisition [Line Items]                                            
Exchange ratio (in shares)       1.75   1.75                     1.75 1.75        
Shares of common stock issued in acquisition (in shares) | shares       168.2                                    
Shares of common stock issued in acquisition (in dollars per share) | $ / shares       $ 4.55                                    
Fair value of the Company’s common stock issued       $ 765,373,000                                    
Total operating revenues     $ 28,600,000                           $ 556,200,000          
Total operating expenses     7,000,000.0                           200,900,000          
Acquisition related costs                                     58,800,000      
Restructuring costs                                 28,500,000 $ 102,900,000 74,400,000      
Total consideration       $ 765,373,000                                    
Carrizo | Accounts Payable and Accrued Liabilities                                            
Business Acquisition [Line Items]                                            
Restructuring accruals     $ 52,400,000     $ 5,700,000       $ 52,400,000             5,700,000 5,700,000 52,400,000      
Carrizo | Acquisition & Integration                                            
Business Acquisition [Line Items]                                            
Restructuring costs                                 22,300,000   45,600,000      
Carrizo | Severance costs                                            
Business Acquisition [Line Items]                                            
Restructuring costs                                 $ 6,200,000 35,800,000 $ 28,800,000      
Carrizo | Other associated costs                                            
Business Acquisition [Line Items]                                            
Restructuring costs                                   $ 67,100,000        
Cimarex Energy Company                                            
Business Acquisition [Line Items]                                            
Total operating revenues                               $ 27,300,000            
Total operating expenses                               $ 9,900,000            
Gas and oil area, developed and undeveloped, net | a         28,000                                  
Total consideration         $ 539,500,000                                  
Monarch and Wildhorse                                            
Business Acquisition [Line Items]                                            
Total consideration                             $ 37,800,000              
Wildhorse and Spur                                            
Business Acquisition [Line Items]                                            
Total consideration                           $ 87,900,000                
Non-Operated Working Interest Transaction                                            
Business Acquisition [Line Items]                                            
Gain (loss) on disposal           $ 0                                
Proceeds from sales of working interest $ 29,600,000