Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures (Narrative) (Details)

v3.19.3.a.u2
Acquisitions and Divestitures (Narrative) (Details)
$ / shares in Units, shares in Millions
 3 Months Ended 4 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 20, 2019
USD ($)
$ / shares
shares
Aug. 31, 2018
USD ($)
a
Jun. 05, 2017
USD ($)
a
Feb. 13, 2017
USD ($)
a
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
a
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 07, 2018
USD ($)
May 19, 2017
USD ($)
Oct. 03, 2016
USD ($)
Business Acquisition [Line Items]                                          
Total operating revenues           $ 196,095,000 $ 155,378,000 $ 167,052,000 $ 153,047,000 $ 161,895,000 $ 161,214,000 $ 137,075,000 $ 127,440,000     $ 671,572,000 $ 587,624,000 $ 366,474,000      
Total operating expenses                               498,914,000 328,094,000 225,028,000      
Proceeds from sales of working interest                               $ 294,417,000 $ 9,009,000 $ 20,525,000      
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%   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%                   6.375%     6.375%    
Debt instrument principal amount                                     $ 400,000,000.0    
6.125% Senior Notes due 2024                                          
Business Acquisition [Line Items]                                          
Debt instrument, interest rate, stated (as a percent) 6.125%         6.125%                 6.125% 6.125%   6.125%   6.125% 6.125%
Debt instrument principal amount                                       $ 200,000,000.0 $ 400,000,000.0
Carrizo                                          
Business Acquisition [Line Items]                                          
Acquisition related costs                               $ 15,600,000          
Carrizo | 8.875% Preferred Stock [Member]                                          
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                          
Working interest               66.00%                          
Disposal group, area of land | a               9,850                          
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                                        
Total operating expenses 7,000,000.0                                        
Acquisition related costs                               $ 58,800,000          
Restructuring costs                               74,400,000          
Total consideration   $ 765,373,000                                      
Carrizo | Accounts Payable and Accrued Liabilities                                          
Business Acquisition [Line Items]                                          
Restructuring accruals $ 52,400,000         $ 52,400,000                   52,400,000          
Carrizo | Acquisition & Integration                                          
Business Acquisition [Line Items]                                          
Restructuring costs                               45,600,000          
Carrizo | Severance costs                                          
Business Acquisition [Line Items]                                          
Restructuring costs                               $ 28,800,000          
Cimarex Energy Company                                          
Business Acquisition [Line Items]                                          
Total operating revenues                           $ 27,300,000              
Total operating expenses                           $ 9,900,000              
Total consideration     $ 539,500,000                                    
Gas and oil area, developed and undeveloped, net | a     28,000                                    
Monarch and Wildhorse                                          
Business Acquisition [Line Items]                                          
Total consideration                         $ 37,800,000                
Wildhorse and Spur                                          
Business Acquisition [Line Items]                                          
Total consideration                   $ 87,900,000                      
Delaware Basin                                          
Business Acquisition [Line Items]                                          
Total operating revenues                             $ 36,100,000            
Total operating expenses                             $ 8,500,000            
Working interest         82.00%                                
Total consideration       $ 52,000,000.0 $ 646,600,000                                
Gas and oil area, developed and undeveloped, net | a       2,488 16,688                                
Gas and oil area, developed and undeveloped, gross | a       7,031 29,175                                
Net revenue interest         75.00%