Annual report pursuant to Section 13 and 15(d)

Acquisitions and Divestitures (Unaudited Pro Forma Financial Information) (Details)

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Acquisitions and Divestitures (Unaudited Pro Forma Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Carrizo      
Business Acquisition [Line Items]      
Revenues $ 1,620,357 $ 1,661,171  
Income (loss) from operations 614,668 767,628  
Income (loss) available to common stockholders $ 369,777 $ 734,527  
Net income (loss) per common share:      
Basic (in dollars per share) $ 0.89 $ 1.87  
Diluted (in dollars per share) $ 0.89 $ 1.87  
Cimarex Energy Company      
Business Acquisition [Line Items]      
Revenues   $ 669,236 $ 469,896
Income (loss) from operations   299,090 209,723
Income (loss) available to common stockholders   $ 324,318 $ 181,406
Net income (loss) per common share:      
Basic (in dollars per share)   $ 1.49 $ 0.90
Diluted (in dollars per share)   $ 1.49 $ 0.90
Delaware Basin      
Business Acquisition [Line Items]      
Revenues     $ 369,527
Income (loss) from operations     144,104
Income (loss) available to common stockholders     $ 115,787
Net income (loss) per common share:      
Basic (in dollars per share)     $ 0.57
Diluted (in dollars per share)     $ 0.57